Factual error: In the final surfing scene, Cody and Z are surfing, presumably, off into the sunset. However, being on the north shore (given Z's remark a few moments before), that would mean the wave is rolling to the south which would put the sun toward the east not the west. (01:20:00)
Factual error: When Wilbur tosses Lewis onto the time machine, he should have broken or hit the glass covering the back half. And he is on all fours when the machine becomes visible, which shows he would have had his face hitting the driver seat, yet he scrambles back into the passenger seat without a problem, then is seen barely leaning forward to talk to Wilbur in the future.
Factual error: Doomsday sees a little girl crying in the street and stops his assault on Superman to go attack the little girl. Superman quickly grabs Doomsday around the waist and jumps, rocketing them both up into space before Doomsday can crush her. The shockwave of this jump is seen as the tremendous force causes the street they were standing on to break apart and rubble fly. Yet the little girl is completely unaffected by the shockwave, it passes right through her and she is only feet away from the crater now left from Superman jumping up with Doomsday. (00:25:20)
Factual error: In the scene where the angry mob is attacking the Simpsons in the tree house, Grandpa Simpson is shown aiming a double-barrel shotgun, which he then pumps to ready it for firing. There's no such thing as a double-barrel pump-action shotgun. (00:36:20)
Factual error: When the Level 2 Sentry gun begins firing, you can see Shotgun shells falling out of it instead of the usual ammo casings. (00:00:40)