Continuity mistake: In the opening shot, there is a long shadow over the roof of the bank building as the camera zooms over and towards the windows in the far building. In the next shots, the shadow is gone as the robbers glide across and land on the roof. (00:01:20)
Continuity mistake: In the scene where the mob wearing Joker masks are attempting to zip-line from one building to another, one guy shoots a harpoon at the other building. After being shot, the harpoon never makes it beyond a couple of meters, before it begins to fall down due to gravity. And it doesn't even seem to have enough energy to make it to its target. But in the following scene, the zip-line is shown to be well anchored to the other building. (00:01:55)
Continuity mistake: When the three men in the clown masks are in the van at the start of the film the man at the back (who is the joker) is getting ready for the heist the shot cuts to the two men in the front seats and he is just relaxing in the back. (00:02:00)
Continuity mistake: In the opening heist scene, a clown grabs a bald bank teller. In the wide shot, the blonde bank teller to the clown's left reacts in fear. However in the very next shot, she is motionless and reacts again in fear. (00:02:45)
Continuity mistake: The bank manager shoots one robber in the back with the shotgun. We then see clown dive behind a counter for cover. In this shot, the manager has left the office and is a fair distance away from it. Camera cuts and he's just outside his office again. (00:04:00)
Continuity mistake: During the opening bank robbery scene, the Joker reaches down to toss a duffel bag of money to the school bus driver. He is holding his pistol in his left hand and reaches for the bag with his right. But in the very next shot, his pistol is in his right hand and the bag is in his left. (00:04:50)
Continuity mistake: During the bank scene, the Joker shoots the bus driver and he falls dead in front of the bus. As the Joker approaches the Bank manager to put the gas can in his mouth, you can still see the body. But after he removes his mask and walks toward the bus, the driver's body is gone. (00:05:30)
Continuity mistake: During the bank robbery, when Joker takes off his mask, before the camera changes angles, he uses his right hand to remove the mask and his left hand is holding up the manager's head. When it cuts to a front view, he is using his left hand to remove the mask, but when it cuts back to the first angle Joker's left hand is supporting the manager's head again. (00:05:30)
Continuity mistake: When Joker puts the smoke bomb inside the bank manager's mouth, watch a green sign behind lying on the floor, with a tree painted on it. It has a stick on top which moves around between shots with no one touching it. (00:05:50)
Continuity mistake: As Batman appears in the bank vault, Ramirez looks to Gordon. The scene cuts to Gordon, who acknowledges her to leave the vault. When the scene cuts back again she is already a few meters behind Batman. There's not enough time for her to cover the distance. (00:10:15)
Continuity mistake: During the scene where Alfred tends to Bruce's bite wounds, the angle cuts several times between Alfred and Bruce. When the camera is on Alfred, Bruce is mostly looking down towards the wound. When the camera is on Bruce, he looks straight at the camera. (00:12:25)
Continuity mistake: When the Joker is taken to Gambol, he shoots a pool ball. We hear it connect with another ball, and then five seconds later the ball reappears. When it reappears it is moving too fast to have taken the time it did. (00:28:30)
Continuity mistake: When Fox is showing the sonar to Bruce, the way Bruce holds the phone changes between shots. (00:32:25)
Continuity mistake: When Joker is looking for Harvey, he grabs Rachael and holds her head. Camera cuts and his grip on her head/face changed instantly. (00:49:25)
Continuity mistake: When Bruce gets on his motor bike on the way to the apartment, overlooking the governor's speech, his hair is all greased back. But when he gets off the bike and takes his helmet off, his hair is fuller and not as greasy. When they cut to him inside the apartment, his hair is once again greased back like it was before he got on the bike. (00:57:30)
Continuity mistake: When Alfred finds a match to the fingerprint we see Bruce pushing the motorbike in the background. Camera cut and Bruce has stopped pushing the bike, got on, and is sorting his helmet out. (00:58:10)
Continuity mistake: When Harvey is talking to the fake cop, he hold a coin and says, "Heads, you keep yours, tails, not so lucky." When he says this, the way he holds the coin changes instantly. (01:04:10)
Continuity mistake: In the car chase, as they exit onto lower 5th, the convoy has, in order, a police cruiser, 2 swat vans, then 2 cruisers. When the garbage truck pulls up next to the convoy, he takes out the second to last cruiser first (there is a car visible behind). It then spins out another cruiser in front of it before reaching the van with Dent in it, but there should have been no other cruiser between that one and the van. (01:13:00)
Continuity mistake: During the chase on Lower Fifth, the refuse truck's left headlamp is alternately present and lit, or completely missing (not just unlit). (01:13:30)
Continuity mistake: As the joker loads the second RPG we see the garbage truck back away from the SWAT van by a few feet. Camera changes to the rear of the SWAT van and the garbage truck is touching it again. (01:13:45)
Answer: It's habit, and a sensible one at that. When he's in the mask, when he's being Batman, he uses the voice, even if the person he's with knows who he is. If he drops back to his normal voice with some people, it sets the precedent for using it while wearing the cowl, which means that he's more likely to slip up and use it around people who don't know, potentially revealing his true identity. If he sticks rigidly to using the voice when kitted up as Batman, regardless of situation, it minimises that possibility.
Tailkinker ★