Waylon refers to the house across the street, when in fact the house clearly is next door on the same side of the street.
When Irving punches Buzz in the face, he uses his right fist to do it. Buzz, however, jerks his face in the wrong direction, as if he just got struck with a left-handed blow.
No amount of smoke will set off a sprinkler system, only heat applied directly to a single sprinkler head will set off the individual sprinkler, not the entire system.
Rundown convenience store doors are hardly watertight.
At the end of the film, when Waylon, Buzz and the Gooch are talking, the cameraman is reflected in Gooch's sunglasses.