Other mistake: One of the three girls swallows the wedding ring and later it's retrieved by pulling it out of her stomach, but earlier in the fight in the toilet when the boy's head came off, there were no pipes or tubes connecting the head to the stomach.
Suggested correction: There's nothing saying they all had to be the same model. Some have pipes; some don't.
Plot hole: When they leave the B+B Gary's car The Beast is left parked outside as they walk into town. Later in the film they get to The King's Head and The Beast is parked out of the back of the pub. It's later used to escape from the next pub when it is driven through the wall. The Beast should be still at the B+B.
Suggested correction: The pub crawl takes them on a circular route. The car is exactly where they left it, outside the B&B, which is also at the rear of the Kings Head.
