Corrected entry: In the scene where Vicky Vale and Knox are looking into the mirror and wandering around Bruce Wayne's armour room, after Bruce leaves them it shows them being video-taped by a camera through the mirror, which is completely sound-proof. However, in the next scene, it shows the tape playing and you can very clearly hear their foot-steps as they walk around.
Corrected entry: When the purple poison gas is being pumped into the art gallery, the waiter falls unconscious before he actually inhales the gas. He simply looks at it, and then faints before the gas actually reaches his mouth or nose.
Correction: It is possible that the poison is very concentrated, and only a bit needs to reach him to make him unconscious. We would not necessarily see the little bit, but just the big cloud.
Corrected entry: In the shot where Batman crashes in on Joker's dinner in the museum, you can see the wire he's hooked to (as he crashes through the skylight).
Correction: This is not a mistake. Batman can't fly on his own and needs a wire or rope to make it seem like he is flying. Sometimes the people around him would see the wire and sometime they wouldn't, but in either case it's not a mistake.
Corrected entry: Before the fight scene in the bell tower, the Joker sprays acid all over the bell and it falls all the way down to the first storey. However, the bell is up in the tower again when Batman is fighting the big guy. (01:01:05)
Correction: There was more than one bell in the bell tower.
Corrected entry: When Batman steals Joker's balloons, one of the buttons on the control panel is labelled "volume." It is also visible when he arms the machine gun and the missiles to shoot at the Joker.
Correction: There are a number of reasons and uses for a volume button, even in a fancy superhero jet.
Corrected entry: When Vicki grabs the device off Batman's belt to be pulled up to the catwalk, she is barefoot, but when she climbs over the railing, she has white shoes on.
Correction: Vicki isn't wearing shoes when she's climbing the rail. If you zoom in you can see that she's still barefoot. The white on her feet is the light reflecting off of her foot.
Corrected entry: When the gangsters come out of the courthouse and Joker throws a feather into one of their necks, there are two policemen standing on the steps behind the dead man. Despite the fact that the crowd reacts to this blatant public assassination the two coppers do absolutely nothing. They don't attempt to apprehend the Joker or hold back the crowd. They don't even look surprised. They just stand there. I know Gotham's cops are ineffectual but come on.
Correction: The two police officers are not really officers because they work for the Joker. They are actually two of the Joker's goons pretending to be officers.
Corrected entry: When Batman is in his plane and stealing the Joker's balloons, he flicks 3 switches to close the claw around the cables. If you look closely, you can see that the red light next to these switches is labelled "volume" - not really anything to do with the claw; and more to do with his stereo.
Correction: The red light has no labeling anywhere near it that says 'Volume', nor do any of the switches that he hits.
Corrected entry: Right at the start of the film when the family are being mugged, you see the crook knock the father out with his gun but when he hits the man, he drops the gun and his hand goes out of shot. When he lifts his hand up to point it at the women the gun is back in his hand. This is much easier to see if you watch it in slow motion. (00:01:40)
Correction: The mugger never does drop the gun, he just awkwardly handles it on its way off screen, and he just pulls his arm up from behind his coat to threaten the mother.
Corrected entry: When Jack shoots at Batman in the factory, Batman deflects it into a glass gauge, which shatters into Jack's face cutting it down the entire side. But when Jack shows up to kill his boss, there's no damage of any sort to his face.
Correction: Several days pass between these two events, during which Jack undergoes extensive facial surgery. And there is damage to his face - the permanent smile.
Corrected entry: When Batman drops the small grenade in Axis Chemicals to blow up the building, the first place that explodes is about halfway up the length of the building.
Correction: Since we see the explosion from the outside this can't really classified as a mistake. There could have been a lot of explosive material at that part of the building. As we have seen earlier in the film, there are no separate floors in the building, just catwalks & such, so this is quite possible.
Corrected entry: In the scene when Vicki is running up the stairs in the bell tower, at the beginning she has white high heels on. In a later shot, a distance up the stairs, she has flats on, then in the shots at the top of the bell tower, she has her high heels back on.
Correction: Vicki and the Joker pause at a landing where Vicki falls and loses a shoe. Joker kisses the shoe and throws it over the railing. When they reach the top of the bell tower, Vicki is in stocking feet for the rest of the sequence, not flats or heels.
Corrected entry: During Bruce & Vickie's first date, dinner at Wayne Manor, Bruce asks her if she had a hard time finding the house. Vickie had been at a party there a few evenings before with Knox and, in fact, had met Bruce for the first time that evening. Why would he ask her this as though she'd never been there before?
Correction: He was trying to break the ice, maybe even trying to be funny in a way. It's not really a mistake, just awkward conversation.
Corrected entry: Near the end of the film, where Vicky and Alfred are talking by the car, you can clearly see the boom mike (it's orange) in the top of the screen, and it stays there throughout the whole scene.
Correction: Apparently not - it's an orange flag hanging off a building.
Corrected entry: A miniature of the Batwing and the city were used to shoot the wide shots of the Batwing flying through the city.
Correction: We don't have the technology to build a full size, real life Batwing and fly it through a real life Gotham city. I doubt the movie would have the budget either. Not really trivia - how else were they supposed to make it?
Correction: The camera room is sound-proofed, however, it is fairly obvious that the room itself must be bugged. It wouldn't have been that hard for a mega-millionaire to purchase and place a small microphone in each of the exhibits. Judging by the scene with Commissioner Gordan and the fact that he can be heard quite easily, one can assume that the entire mansion is wired for both video and sound.