When Max hits Sid in the face with the keyboard, blood and gore visibly splats from the impact. Yet a moment later, Sid's face is clearly shown and looks no bloodier than it does in his usual zombie condition.
When Sid and Norm bump into Jared Woodnit in the audition line, lighting equipment is briefly visible on the top-left side of the screen. Later in the same sequence, a sandbag can be seen briefly when the camera moves up from the pile of headshots.
When Sally is attacked near the red car, part of a crew member is visible on the left side of the screen. He was there holding a reflector to help light the actors' faces.