Continuity mistake: Dan tells Crystal that his shoe size is size 11. Later in the season, during episode 16, "Mall Story", Dan tells a shoe salesman he takes a size 13. Dan's an older guy and his foot size would not grow during the short gap between the episodes - the first took place during Fall and the second took place during Spring.
Continuity mistake: After Booker announces the overtime, Roseanne asks Jackie for a quarter. Jackie takes her glove off her right hand. In the next shot, Jackie reaches into her purse and takes her glove off her right hand a second time, before getting a coin out of her coin purse.
Continuity mistake: When Dan heads back to the bar after hitting the drywall with his hammer, Roseanne goes there to find him. While they're talking, we see a crooked painting to Dan's left, and a lamp hanging straight. Then, in the next shot, suddenly the painting has been straightened, and the lamp is crooked.