Other mistake: The photo of Riddler's arrest shown in the news has the same angle as what we saw, which is the polar opposite side of the corridor Riddler's hired photographers came from. (00:10:10 - 00:12:10)
Batman (1966)
1 other mistake in Hi Diddle Riddle (1) - chronological order
Directed by: Leslie H. Martinson
Starring: Cesar Romero, Adam West, Burt Ward, Lee Meriwether
Smack in the Middle (2) - S1-E2
Revealing mistake: While Riddler is with the unconscious guests at the Moldavian exhibit, in the basement of the Moldavian Pavilion the Mole Hill gang blow up the ceiling to create an entry to the exhibit, on the floor above. They lean two tall ladders at the side of the hole and climb up. When Riddler makes for an escape Batman follows him down below, and now we can see long metal brackets bolting the ladders to the floor for safety. (00:20:20 - 00:22:00)
The Riddler: You and your trained, exploding shark.
The Penguin: How was I to know they'd have a can of shark-repellent Batspray handy?
Trivia: In his appearances as The Joker, Cesar Romero's moustache is visible under his makeup. Romero refused to shave it off, so his makeup had to be applied over it.
Question: What city was used for Gotham City?
Answer: There wasn't one singular city used. It was shot in and around various locations in California, plus on a lot of sets and backlots. Ex. Some scenes were shot in LA, some in Pasadena, some in Santa Barbara, etc.
TedStixon