Continuity mistake: In the final fight, Batman shoots the blades out of his gauntlet to knock the detonator out of the Joker's hand. About a half second later, Batman throws Joker over him and off the ledge. If you pay attention, the blades have reappeared on Batman's gauntlet for this one quick shot. They are then appropriately missing for the rest of the scene. (This mistake goes by quickly, so slow motion helps but is NOT required.)
Continuity mistake: One of the batpod arms guards/shields covering the handles falls off when Batman hits the truck when trying to avoid hitting the Joker. It's on the floor after that stunt, but when the Joker walks towards Batman, it's not there and gets reattached. (01:22:17)
Visible crew/equipment: When the Joker places the smoke grenade in the bank manager's mouth, a wire or tube can be seen on the left side of his face. It's only visible in the shot when the string pulls the pin, as soon as he drives away in the bus.
Answer: Look where he's standing just before it goes off. The Joker's carefully positioned himself close to a set of heavy filing cabinets, which are between him and the blast, protecting his legs and almost all of his torso. As the bomb goes off, you can see him duck his head down, allowing the blast to pass him by almost completely. He gets to walk away unscathed because the blast never really hits him.
Tailkinker ★