When Eddie inspects the newspaper with a magnifying glass, Jessica Rabbit appears in the newspaper picture with quite different looks.
Eddie is watching Jessica Rabbit sing for the first time. Betty Boop is beside Eddie, conversing with him. When the camera pans behind Jessica, Eddie can be seen without Betty Boop standing next to him. When the camera returns to Eddie and Betty, she is again conversing with him.
Eddie's toon gun becomes a live-action prop after entering the alley at Toontown.
When the Weasels pull up to Eddie's apartment, the Weasels' car completely hides the Fire Hydrant. The next time we see it, the Hydrant is visible (there was no one in the vehicle to move it).
After Eddie shows the guy the check at the bus, he folds it, in the next shot, he folds it again.
In one scene, a Pacific Electric Red Car is seen passing by with both of its trolley poles raised. The pole pointing forward would likely jump the wire and severely damage the overhead wire supports.
California State Highway 110, the state's first freeway, was already carrying traffic in 1947.
Eddie was clearly shown winding the film advance after taking the first picture of Marvin and Jessica. Since the camera lacks auto-advance, it couldn't have been used to take the series of photos of Jessica and Marvin playing patty-cake that Roger flips through later.
Throughout the movie the streetcar tracks are shown as merely railheads slightly higher than pavement level. All in-street rail requires a flangeway for the wheel flanges that keep the wheels on the track. Typically, grooved rail or girder rail would be used.
During the scene where Eddie Valiant and Roger hides in the secret room in the bar for the first time, Eddie hands Dolores a picture of Acme's will. The picture however is cropped and only shows his pocket with the will in it. Yet from the moment Eddie first notices the will on the picture on the news paper, and until he hands the picture to Dolores, there is no time that he would have had the time to crop the photo. Back in 1947 to crop the image he would have had to re-process the photos from the negatives, and he did not have the time to do so between the two scenes.
Some of the Toons living in Toontown were not created in the real world until after 1947. In the movie's world they were already living in Toontown, and not "discovered" until 1949, 1953, and the other years when they made their specific debuts.
A bar patron introduces Judge Doom to his invisible rabbit friend, Harvey (1950). While the movie was not produced by 1947, it was already a play in 1944.
Early in the film, R.K. Maroon and an editor are cutting together a cartoon in his office. The editor then leaves, dragging the film along the floor behind him. This would have scratched the film, rendering it useless. Not to mention it's a tangled mess.
The fact is, the human world is just as unrealistic. If it were real, the above film would not have had a soundtrack at that point. Nothing is real.
The fact is, the human world is just as unrealistic. If it were real, the above film would not have had a soundtrack at that point. Nothing is real.
After Roger blows his nose on the handkerchief, it's obvious R. K. Maroon didn't grab the handkerchief out of his hand. It appears he was reaching down to get the handkerchief. However, Maroon's handkerchief would have presumably been dirtied by Roger's tears and nose blowing. A person would normally try to retrieve such a handkerchief by taking it gingerly by a place presumed to be unspoiled. This reaction is further verified by the fact that Maroon immediately places the handkerchief in the wastebasket.
When the characters are in the warehouse in the end Judge Doom slips on some balls and hits the floor. When he rolls over (1:23) he is holding his hand over his right eye, obviously because he had lost the lens there, exposing how his eyes really look. When we see Doom again on the lift (1:26) he has both lenses in his glasses.
This could be because he went off to get a new pair.
A live-action model was used in the scene in the Ink and Paint club during Jessica's song parts of her were rotoscoped in order to cover the model up. Jessica interacts with Marvin Acme by pinching his cheeks and then taking his handkerchief out of his coat pocket and polishing his head with it. If you look closely, you will see Jessica's hands briefly grow to human proportions as she interacts with Acme. This occurs again when she interacts with Eddie later in the same scene. In fact, there is a tiny glitch in the animation of her hands as they go from rotoscope to animation after she shoves Eddie's hat into his face. Finally, as the camera closes in on Jessica and Eddie in the final moments of the song if you slow down the film speed, you will see Jessica's dress move ahead of her for a few frames to cover the performance model. Again Jessica's hands are rotoscoped as they pull on Eddie's tie.
When Roger Rabbit drinks the whiskey in the bar while being held at the neck by Judge Doom, the Judge briefly lets go of him, but Roger doesn't fall down. (The moment he let go was when Roger swallows the whiskey, so he presumably opened up his hand to allow space for Roger's neck to get bigger when the whiskey is swallowed. However he may have opened his hand too wide or the animation was not successfully drawn to match the hand movement.)
Jessica's frying pan changes from live-action to animated between shots.
As 'toon director Raoul J. Raoul storms off the set carrying his coat, the coat sleeve rises under its own power to meet Roger Rabbit's hand.
When Eddie lowers the hook holding Roger and Jessica, the chain stays still as the hook lowers. It should be moving through the pulley.
In the end credits the location of Cannon's studio is written as "Hertz". It should be "Herts.", an abbreviation of Hertfordshire.
The opening sequence shows the entire short film that Roger and Baby Herman were filming, up until the director yells cut. The camera shows wide shots of Roger running across all four walls of the kitchen. After Raul yells "cut," however, the camera pulls back to reveal that the kitchen was just a partial set, with the "fourth wall" removed.
When one of the weasels first starts the Dip machine, he turns the ignition and presses down on the carburetor. Eddie turns off the machine before Dip could spray Roger and Jessica. Judge Doom turns it back on but without needing to press the carburetor. (Before fuel injection starts existed where you pressed the brake, there were carburetor starts which involved stepping on the gas pedal.)
The Hollywood sign is visible through Eddie Valiant's office window. In 1947, the sign would read HOLLYWOODLAND, the "LAND" part of the sign was taken off in 1949.
Film takes place in 1947. The short that Roger and Eddie watch at the theater, Goofy Gymnastics (1949), was not released until two years later. The filmmakers knew this (see trivia).
Porky Pig says "That's All Folks!" as if for the first time. He actually first used the phrase in the 1930s.
The tray Betty Boop is carrying contains Camel brand cigarettes in their late 1980s packaging.
On Eddie's desk, a picture labeled "Eddie & Teddy on the Road with Dad - 1906" features a prominent Ringling Bros. and Barnum & Bailey banner. The two circuses weren't merged until 1919.
When Roger was reading the love letter, Eddie leaves the screen. When Roger said "obviously" his mouth didn't move at all.
When Eddie Valiant smacks Roger Rabbit in the back of his head at the movie theater, the sound of the smack starts before Eddie Valiant's hand hits Roger's head.
When Eddie Valiant is first leaving R. K. Maroon's office, he looks to see the man playing the saxophone for the Fantasia (1940) brooms. Yet, the sax player is not moving his fingers, but merely holding the sax. He is not playing it at all, just moving around.
As Eddie Valiant drags R.K. Maroon to the Movieola, Maroon says "I'm a cartoon maker, not a murderer." The close-up of Eddie and Maroon at the Movieola occurs just as Maroon is saying "murderer", but he is not speaking.
To save money, they use a synthesizer instead of a real saxophone at the studio scene when the brooms are dancing.
When Roger is smashing the plates on his head, the metal arm moving the plates can be glimpsed under Roger's animation in a few frames.
When Hyacinth Hippo (the ballerina from Fantasia (1940)) sits on the bench, causing the man opposite her to be catapulted into the sky, you can see the cable that is pulling him up into the air.
Assistant director visible in reflection in trolley car window as Eddie leaves the studio lot after his first visit to Maroon's office.
When Eddie and Roger escape from the Weasels in the bar, they run to the Weasels' truck. Roger squeezes through the slot to find Benny and the love letter pops out. You can see a crew member's black gloved hand shove the letter through to Eddie.
After Roger spots the weasels from Eddie's office and goes into a frenzy, he pulls Eddie under the bed because they are cuffed together. You can clearly see the trolley placed under Eddie to make it seem like he was sliding on the floor.
When Valiant and Jessica encounter each other in Toontown, Doom is seen running away (on foot). Somehow, he reaches the other side of the tunnel to enter Toontown well before Valiant and Jessica do, even though the two escaped with Benny the cab.
Hiding in a movie theatre wouldn't have been a good idea as anyone there could have recognized Roger and turned him into the authorities.
Roger claims to have not known where Valliant's office was. Later on, however, Jessica somehow knows where to find him.
After the weasels visit Eddie's office and say their goodbyes, Eddie tells Roger that they left mere seconds after the last one left the frame. In that short time they would still be in the room and hear all that.
When Eddie goes to the ACME warehouse after Marvin's murder, he says he hasn't been that close to Toontown for a long time. However, he had been at Maroon Studios, just across the street, the previous day.
When Judge Doom is looking for Roger in the terminal bar, the menu behind him, says 'Todays Special', missing the apostrophe.
Doom tells the weasels they will die laughing like their "idiot hyena cousins". Weasels and hyenas are not related, they belong to completely separate families of animals (Mustelidae and Hyaenidae respectively).
Roger starts his letter, "Dear Jessica, how do I love thee...", but the letter, as written, shows a different name, it starts: "Dear Jessy...", and Roger isn't even using the correct shortening of her name, which would be "Jessie."