Out of anger, Jessie punches her stepbrother Eric on the left side of his face. Eric reacts by putting his hand on his right eye, where a bruise later develops.
In Zack's narration that recaps the previous episode, he says that Lisa crashed Mr. Belding's car "into a brick wall." Yet in the footage that is shown, the car has crashed into some bushes.
Zack says he's going to hold the lottery drawing in Mr. Sachs' Algebra class that afternoon. In the previous episode it was established that Zack and Eric have Mr. Sachs' Algebra class as their very first class in the morning.
Eric decides to get back at Zack and Slater by having the auto mechanic class take apart Mr. Belding's new car. He then puts the car back together himself. This whole sequence of events takes place over a weekend. The likelihood of taking a car completely apart and putting it back together in one weekend is impossible. There is also a reference to the car needing a new carburetor. As this is late 1991, the vehicle likely has fuel injection, not a carburetor.