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: 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?
Other mistake: Robin yells "Holy Polaris" before the rocket even breaks the surface of the water.
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.
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.
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: 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.
Continuity mistake: When Robin is saving Batman from the shark, and he is hanging upside down to spray the shark repellent, his position in relation to Batman changes between shots (almost too far to reach, then he is suddenly close).
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.
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.
Other mistake: When Penguin and the others attack Bruce on his date in his hotel room, Penguin is the first one to charge him. Bruce takes a swing at Penguin's face and he goes flying from the blow. You don't even need to slow the film down to see that Bruce totally misses him.
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: When Batman and Robin are trapped on the buoy, they can see the periscope for the submarine sticking above the water, yet whenever a torpedo is launched, it is shown approaching from a distance much further away.
Other mistake: When Batman is climbing the ladder and the shark has his leg, Batman works very hard at trying to place his radio back on his utility belt only to have it fall off.
Other mistake: If you look closely at the top left part of the screen, you can see Penguin hit Robin with the umbrella and turn to the zip line in a far shot of the fight. One shot later, just after Batman kicks a pirate off the side of the sub, the same act is repeated when the camera is focused on the two of them.
Deliberate mistake: When the fight first begins on deck of the sub, a henchman jumps from the hatch and picks up a wrench that was lying on deck. If the sub just surfaced, where did that wrench come from?
Continuity mistake: When the villains are checking to see if Batman and Robin were hit by the torpedo, one shot has the submarine itself surfacing but in the next shot only the periscope is above water.
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.
Revealing mistake: As Riddler is going overboard after being spun around by Batman with the deck gun, it's obviously a stunt double in green tights.
Answer: The timeline of the movie is important to consider. The 1966 film began production while season 1 of the TV series was being aired. Eartha Kitt didn't play Catwoman until season 3. According to the TV show "Biography", Newmar was suffering from a back injury and unable to reprise her role for the movie. But she was able to recover by the time they started shooting the 2nd season. So, for the movie they hired Meriweather.
Bishop73