Other mistake: When Skinner calls his lawyer he never dials the phone.
Other mistake: When Leela is signing the petition, Amy grows a third arm for a split second.
Other mistake: After all the plants have stopped being pollenated when the pollen jocks are getting ready for liftoff you see the branches outside the window have green leaves.
Other mistake: When Homer drives through the barrier the second time (leaving the lake after dumping the silo) pay very close attention, his car smashes one portion of the barrier, but his car passes through a second portion of the barrier without breaking it. (00:23:50)
Other mistake: Right at the beginning of the movie, when Lewis's real mum picks him up from the box and hugs him, it's no more than three seconds before she hears Lewis from the future slipping on the step. She gets scared and puts baby Lewis back in the box. When Wilbur takes Lewis to meet his mum, near the end of the movie, the time his mum holds the baby is more than twenty five seconds.
Other mistake: After Dark Superman destroys the weapons of the cops that try to arrest him, he walks away down the sidewalk. As he does, there is a yellow vehicle on the side of the road. This vehicle is horribly drawn and does not make sense. There are no headlights, there are no doors, just one line down the center of the side showing some sort of separation between the front and back halves of the car. There is no hood, the front of the car being a solid piece. There are no side view mirrors. And the wheels are so small, you could hardly get them on a child's toy truck. There is also a very large orange square on the side by the bumper next to a fire hydrant that appears to be a blinker or reflector, but it is way too large. (00:51:15)
Other mistake: Whenever the fire scene is going in slow motion, the fire in the background is not in slow motion. (01:07:00)