Crew or equipment visible: Near the end of the film when the monster has crashed through the wall of the bar, the monster rips off his deer skull mask/helmet to show his true face. As soon as he tears the mask/helmet away, look carefully to the right of the screen. For a split second, you can see the black outline of a person standing beside it. This is revealed in the commentary.
Continuity: The payphone gets shot off the wall and the guy goes to hang up the receiver but, obviously, it falls as there is no longer a payphone there but a hole. In the next scene the receiver is hung up in the wall.
Continuity: The point in the movie where beer-guy (Judah Friedlander) is getting washed after being 'slimed' (22:10 to 22:35), the amount of maggots covering him (especially his hair) changes drastically between shots.