Visible crew/equipment: During the final fight, a steady cam operator with a white shirt and black straps around his body is seen during several wide angles. This is not a TV camera, it is a film crewmember. The Director even admits to it in the audio commentary on the DVD.
Revealing mistake: A crowd of people are watching the filming as Harry sprays one of the kidnappers with a water hose. (01:25:49)
Continuity mistake: When Christella is slapped by the possessed Ike, her pose changes between shots.