Continuity mistake: When Sergeant Gordon puts the jacket around a young Bruce, the jacket is lying smooth around Bruce in the first shots. In the consecutive shot where Gordon says, "It's okay" for the second time, there's suddenly a huge bulge in the jacket on Bruce's left shoulder, but in the next shot, the jacket is smooth again.
Continuity mistake: As Ducard is sliding down the ice toward the cliff, he's on his front, sliding feet first. Bruce is also on his stomach, but sliding head first. Then, just before Ducard goes over the edge, Bruce is instantly on his back, sliding sideways, right side toward Ducard, just in time to take Ducard's hand, saving him.
Continuity mistake: When Bruce defeats the Ra's impostor, the overhead beams collapse down as Ra's rolls onto his left side, head turned further left toward the floor to shield his face. As this shot ends, the debris settles, and we can see Ra's does not change position. But a close-up shows that Ra's is now flat on his back, head turned to his right.
Continuity mistake: As Ducard goes over the cliff's edge, Bruce is dragged over the edge in the distant shots, with only his left arm still on top of the cliff, holding the knife in the ice. But the close-ups (prior to the big explosion) show only his right arm and leg are over the edge with Ducard, while his body remains on top of the ice.
Revealing mistake: When Bruce Wayne is heading to the hearing at the courthouse, he checks his revolver to make sure it's loaded. His intent is to execute Joe Chill for killing his parents, so he would need a working gun. But when he opens the cylinder of the revolver to make sure it's loaded, you can see that all of the bullets have had the primer removed (the end of each bullet casing has a hole in it.) This is done to make each round impossible to fire, for safety on the set.
Revealing mistake: When Bruce is told to execute the man in the ninja temple, watch the blade closely as he raises it up - the edge is ground down flat for the safety of the actors, he wouldn't be able to cut butter with that sword.