Other mistake: At the end, when Siegfried is about to shoot Max, if you look in the chambers of his gun, there's no bullets in there. So Siegfried is going to kill Max with a puff of air.
Continuity mistake: When Max brings the coffee to the doctor's office, his suit is dark blue. After the opening credits he has no time to change, so how come his suit becomes dark gray?
Suggested correction: After watching the scenes, his suit never changes color. It's always a dark grey, never dark blue.
Audio problem: When in the apartment of the doctor, it is raining, but there's no sound from the rain hitting the building.
Suggested correction: I've been in several different buildings where I can't hear the rain. Even in my own home there's times I can't hear the rain, even though other times I can.
Continuity mistake: When confronted by Siegfried in the restaurant, the position of Siegfried's gun compared to Max's head changes constantly between shots with no time to move.
Visible crew/equipment: When Siegfried throws the cup into the air and Doctor T holds it up with his force field, a wire is visible holding the cup in the air.