Subliminal Messages... Bad Editing
Interesting the scene in which Brewster finally consumates his relationship with Shelly Duvall's character. Notice as he walks towards the closet, he passes a poster or flyboard of Mash.
Also like the scene where the police office crashes the right side of the camaro, yet the left side is show throughout the rest of the movie with the dent.
And of course, the Bird Sh** was a great affect.