Revealing mistake: When Jack and Marty drive the skinny lady to her inbred folks Jack follows one of them into his house. He has a terrarium where a snake is just swallowing a screaming but otherwise lifeless rat. (00:50:15)
Suggested correction: The rat's last dying gasp? Morticians will also tell you that if you compress a corpse's chest, the deceased will make moaning noises as air from the lungs is forced out and past the vocal chords. Why couldn't the same process happen with a rat?