Visible crew/equipment: In the sequence where The Narrator is explaining about Tyler's projectionist job, a boom mike is visible at the upper left hand side of the screen, before Tyler explains about the cigarette burns.
Visible crew/equipment: During the police interrogation The Narrator is pinned to the table, after he gets the gun and rolls back off the table you can easily see the power pack attached to his back/underpants during the roll. (01:58:10)
Visible crew/equipment: Tyler and the narrator are walking to the house for the first time. This shot tracks along the road. The camera track can be seen on the road (metal pipes), and the camera stops where you'd expect the end of the track to be.
Answer: Most likely they either went back afterwards or chased the security guard off somehow. It's also possible with all their inside connections that they stole the body from police custody.
Greg Dwyer