Continuity mistake: The height of the stack of magazines on the coffee table in front of John changes with the camera's view. Front views of John show a high stack of maybe 15 magazines. Side views of John show a much shorter stack of several magazines. (00:25:03 - 00:26:07)
Continuity mistake: When his gallery blows up, 3 people are on the ground. Camera does a 360° around John and they are gone. (01:18:35)