Continuity mistake: After leaving Judge Doom to be flattened by the steamroller, Eddie runs over to the dip machine and turns off the ignition. If you watch as Roger and Jessica are about to be blasted with dip, the stream of dip goes from being on their left side, to right, then back to left again between shots. (01:28:35)
Continuity mistake: When Judge Doom is melting and is just about to die, the wide angle shows he's surround by a very thick cloud of yellow smoke that keeps us from seeing his face, then in the close-up it changes to a very thin smoke that allows to see his face, and then back to the wide angle and the thick smoke again. (01:31:55)
Continuity mistake: When the spray-machine is about to kill Roger and Jessica it smashes a brick wall with some lettering and a thick white line painted below. In the close-up the lettering and the line are gone. (01:32:25)
Continuity mistake: After saving Toon Town from Judge Doom, Eddie lowers the giant hook and starts untying Jessica and Roger. He throws one rope offscreen and the other just slips from the hook on its own. But in the following shot no rope can be seen on the ground directly below the hook where it should have landed. (01:33:10)
Continuity mistake: When Roger starts reading Marvin Acme's will out loud, Jessica takes her left hand and rubs his head, but once the shot changes her hand is nowhere to be seen. (01:35:05)
Continuity mistake: At the end of the film, when Delores and Valiant are about to kiss, she has her right arm down. A second later, from a new angle, it's up. (01:35:35)
Continuity mistake: Throughout the film the buttons on Smart Guy's jacket switch from pink to gold.
Continuity mistake: At the end of the movie, when the spray-machine breaks the brick wall with the word 'Keep Clear' painted on it, the first 'E' and the 'A' get destroyed, but appear rebuilt a second later.
Continuity mistake: In the climactic scene where the Red Car is about to "Dip" Roger and Jessica, one shot of Eddie (shot upward from the ground) also includes the hook that Roger and Jessica are hanging from. However, Roger and Jessica are not animated into this shot.
Continuity mistake: At the very end of the movie, when the cartoon characters start singing "Smile Darn Ya Smile" together, Just before the scene changes, the cartoon background is gone. When the cartoon characters lets Eddie, Roger and Jessica go to Toontown, the background reappears.
Continuity mistake: While Valiant is driving through Toon Town, there's no continuity between what he sees ahead, and what is seen in the car's rear window seconds later.
Continuity mistake: Roger and Jessica are safe when the spray-machine breaks the brick wall. It then goes through the other side staying on the left side and moving far away from the debris. Angle on Valiant, and when back to the wall the machine has suddenly moved several feet to the right and is crossing the wall again.
