Other mistake: The scene where the Penguin is dehydrating his henchmen. Watch as the last henchmen is dehydrated - the shot changes to the Penguin and the Riddler. You hear the Riddler's laugh but his lips don't move until the end of the laugh.
Continuity mistake: When the Batmobile is going to park (before the bomb scene) there is a sign saying "Mobey Dick Parking Only". When he is later carrying the bomb and passes by the Batmobile the sign is not there.
Revealing mistake: When the Penguin is sliding down the zip line, just before he hits Batman you can see Batman throwing a punch at nobody, he is swinging at empty air.
Continuity mistake: When Bruce Wayne escapes from the United Underworld (Joker, Penguin, Riddler and Catwoman), he climbs to the top of their hideout (Ye Olde Benbow Taverne) and jumps from the top of the roof (to the water below). But in the next shot, Bruce now jumps from the edge of the roof and dives into the water.
Continuity mistake: Near the end of the film we visit the office where the country representatives had argued earlier. Batman sets up the chemical equipment to bring them back. When it's done, where has the equipment on the seats gone?
Continuity mistake: During the fight on the submarine, just before Robin punches the Joker into the water there is nobody else on the deck. When the Joker is shown falling overboard, two other henchmen are sprawled out on the deck near him.
Revealing mistake: In the first shot of Adam West and Burt Ward driving in a beige '66 Imperial convertible, the camera zooms out above the car - but not before you can see that the two men in the car are stand-ins for Adam and Burt.
Other mistake: When the Joker fires a missile near the end of the movie it curves to the left. The writing on the missile is backwards, showing that it is reversed footage from earlier in the film, when it curved to the right.
Revealing mistake: Batman is lowered into the ocean and a shark attacks his leg. When Robin in the Batcopter pulls both Batman and the shark up out of the water, the very fake looking shark has gallons of water pouring out the back of it where there must have been a large hole.
Revealing mistake: The swords and wrench used in the final fight were poorly made rubber items as they shake and bend whenever they hit something.
Continuity mistake: The amounts of colored powder in the vials change in every shot; sometimes they are all equal, other times there are large differences between them.
Other mistake: When the Batboat is approaching the submarine before the final fight, the shot from the periscope is an overhead shot, not a surface shot like all the others in the film.
Continuity mistake: In the helicopter scene in the first 10 minutes of the movie, Batman moves down on the ladder and stops. In that first shot you can see that there are about 10-12 rungs below him. In the next shot there are only two. Shortly after he gets attacked by the shark there are now at least four rungs below him, and yet he has not made any attempt to move up or down.
Continuity mistake: When Batman discovers a bomb, he is driving towards the villain's hide out and you can see all the parking spaces are full except one, yet when he parks there are no cars on either side of him.