Shaft's Camaro Z28 changes from a Z28/Rally Sport (a.k.a. Z28/RS) to a base Z28 during the chase. A base 1970 Camaro Z28 has the parking lights below the headlights; the Z28/Rally Sport has the parking lights next to the headlights, as well as an open-aired grille.
When the Road Runner makes a left turn on Old Spanish Trail heading west, Johnson's police cruiser switches from a 1970 Plymouth Fury to a 1968 Fury III.
In the car chase scene where Lt. Shaft is pursuing the Roadrunner, the weather inexplicably alternates from clear, cloudless and sunny to completely overcast and gray between shots.
In the scene where Brewster and Suzanne are driving in the mango orange Road Runner, the windshield wipers are beating at a higher speed when the camera cuts to Brewster's shot than they are in Suzanne's shot.
The chase with Shaft begins with a closeup of the traffic light at which Suzanne is waiting in the Road Runner. When the light changes from red to green there's a slight change in the shape and position of the clouds in the background, indicating an edit.
The license plate "BRD SHT" would have been disallowed; Texas had a long list (in about five languages) of things you could not have on custom plates. This also covers the general issue license plate (in 2015 when the Texas Classic general issue license plate reached FCJ the next letter up was FCL since the next letter combination was an expletive; during early 2018 the first three letters up to KKJ was advanced to the KKL since the next combination (KKK) are the initials for the Ku Klux Klan, hence the letter combination KKK-000x was not used.
At the beginning of the car chase, when Duvall drives out of the Astrodome parking garage nearly hitting the cop on a motorcycle, there is a shot of her wearing the black driving gloves. Later in the chase when she is stopped at a light and notices the police car behind her, she puts on the black gloves, supposedly for the first time.
In Detective Shaft's final scene, it is obvious that one of actor Michael Murphy's blue contact lenses has fallen out, revealing one brown eye.
In the scene where Brewster is supposed to have achieved independent flight while wearing birdlike apparatus, in a few places you can clearly see suspension cables attached to his bird costume.
In final scene, as Louise is leaving the Astrodome, and the large, roll-up door opens for her, revealing bright daylight, a stage-hand can be seen operating the door at the far right edge of the scene. This is only visible on wide-screen format; probably only on the LaserDisc.
When the character of Johnson is about to step into Louise's vehicle, a his hat is stained with bird poo. According to the plot, Johnson should die within a few moments. But he doesn't.