Vera goes from wearing a dress that shows decolletage, to her breasts being fully covered, during the party scene.
When Pinky runs into the mirror, it naturally shatters. But the broken glass immediately disappears.
In Mrs. Teasdale's house, when Firefly sits down, everybody (Trentino, Vera and Mrs. Teasdale) changes positions around him.
When Firefly arrives at his reception, he is wearing a dark swallowtail coat. Then after Mrs. Teasdale greets him, we go to a two shot, and Firefly is now wearing a lighter shade jacket with dark piping and a glove in the breast pocket. When Ambassador Trentino enters, Firefly is again wearing the swallowtail coat, which he retains until the very last shot of that scene, when he is again wearing the lighter jacket, without the glove in the pocket.
When Firefly takes the Thompson sub-machine gun from the violin case it has a straight magazine, but when he is firing it through the hole in the wall it has a drum magazine.
The second time a big artillery shell flies through the room, you can see the wire it's on.
When Pinky's motorcycle pulls away from its cart, you can clearly see a string pull it along.
When Pinky runs into the mirror, it doesn't actually shatter until he's fallen onto the floor.
The newspaper clipping telling of the start of Rufus T. Firefly's administration has a header that reads, "Mammoth Reception Arranged to Welcome Nation's Leader Tonight." Although everyone at the reception is wearing evening clothes, and Firefly arrives "when the clock on the wall strikes ten," it can be seen through the windows that it is still daylight. When Firefly leaves the reception to go to the House of Representatives, it is definitely day time.
The removed horseshoes that are lying on the floor (from the horse that Pinky was riding) are not actual horseshoes but the type that are used in the game of horseshoes. They are much larger than regular horseshoes.
The horseshoes also lack the holes for the nails to fasten them on to the horse's hooves.
The horseshoes also lack the holes for the nails to fasten them on to the horse's hooves.
During the "To War, To War" number, when The Marx Brothers quartet are playing banjos and singing as they walk toward the camera, it is clear that Chicolini is only holding his banjo, not playing it.