In the glory hole scene, there's no sight of the pool player's jacket and pants anywhere, but after ejaculation his pants suddenly appear all the way up his thighs while his jacket is suddenly atop the toilet tank.
When the sodomized hitchhiker shouts in ecstasy, the sound quality reveals they are in an enclosed studio rather than outdoors as they're supposed to be.
Bikers Terry and Cole decide to scare camper J.T. by chainsawing through his tent. Since J.T. didn't bring it and neither Terry nor Cole brought it, where did the chainsaw come from?