Mr. Margolies had to teach both music classes simultaneously because the other music teacher was out of commission but he had to go back and forth classrooms every moment. Wouldn't it be easier if he just teach both classes in the same room?
Lisa's last name is Turtle throughout the series, but in the last scene of this episode, Zack addresses her father as "Dr. Turtlelay."
When Slater tries to stop Mr. Belding from leaving his office during the clothing sale, Mr. Belding opens his office door but is then shown entering the hallway from the opposite end of the set.
It seems very unlikely that anyone would have tipped Lisa considering that she and the gang weren't allowing any of the customers to actually eat their food before clearing their tables.
Nitpick: When Lisa drops the tray, Max picks it up and says he velcroed the food to the tray. Everything is perfectly in place. Exactly how do you velcro burgers, fries, and drinks to a tray?
When Mr. Belding shows Mr. Testeverde the questions that he had, Mr. Testeverde says "Those are not the questions to the exam," which would mean that none of the 3 questions mentioned were the test questions. Yet, when Mr. Testeverde reads his questions, one of the questions is one of the questions Mr. Belding stated earlier.
The question is "Discuss the three steps taken by the Second Continental Congress."
In the scene where Slater bets his bomber jacket, the German voice on the radio sounds like it says, "Diese ist Hans. Wo bist du, Elvis?" (This is Hans. Where are you, Elvis?) A witty payoff to Zack's earlier signing off in his room.
Goof: Slater tells Zack that his grade on the midterm was a F-. In school grading systems the lowest you can get is a F. There is no F+ or F-.
Edit: This is intentional. It's an exaggeration to show that an F wasn't low enough and Testeverte created a grade even lower to make a point.
Mr. Belding mentions that he was a National Guardsman in Indiana. Good Morning Miss Bliss, which this show spun-off of, took place in Indiana.
Somewhat of a goof: In The Max when Tony invites Kelly, Jessie, and Lisa to join him, notice when Jessie misses the chair the napkin dispenser on the table falls over. It causes a salt shaker to fly off the table and hit the floor. The shaker is clearly heard smashing on the floor when the shot cuts to Jessie swiping the chair from the extra, and when we see the girls and Tony again Kelly has a "WHOOPS" look on her face like she's trying not to laugh.
In this episode, Kelly states that there are 7 kids in the Kapowski family.
After tasting Slater's cake, Mrs. Cummings comments that she's taking his cake home. But in the next scene at the Max, the gang is scene eating it.
There is no concievable reason why Nedick would come to the Max to pressure Slater into wrestling (especially at the behest of Zack) because--as Nedick himself points out a moment later--without Slater to wrestle him, Nedick automatically wins the bet he had against Zack, and Zack's dirt-bike.
The fake 'beer belly' that is sticking out of the older wrestler-Slater's shirt is obviously fake: when he turns to the side, you can see that it is clearly over the shirt, not coming out from under it; you can also see the straps to it.
In this episode, Kelly decides that she'd like to be either an actress or a housewife. It seems she changes her mind, though, as in a College Years episode a few years later, she tells Zack she is interested in medicine.
When Mrs. Cummings is judging the chocolate cakes the students made, she merely tap-dances past those made by most of the students, and only comments on those made by the main characters of the show.
The first time Kelly goes to Screech's house to be tutored, he's wearing a jacket with the word "FETISH" on the back. Fetish is defined as: anything to which one is irrationally devoted, as well as, any nonsexual object that abnormally excites erotic feelings. I'm assuming it's an in-joke for Kelly's feelings towards Screech.
Goof: When Screech and Mr. Belding are in the office, Belding finds out that Zack and Slater are at the door. When he opens the door and they fall down, the boom mic can be seen.
It was Lisa who was getting the Fashion Club to make the friendship bracelets for Zack's company, and she stays with Zack's company after Jesse, Slater, and Kelly leave to form their own company. The next day they form Buddy Bands, a similar idea to Zack's friendship bracelets--however, since they don't have Lisa or the Fashion Club, it is never established how they produced the Buddy Bands, or how they intended on continuing to produce enough to compete with the friendship bracelets.
Buddy Bands cost $3.95. However, when Zack buys one (right after he closes down shop), he hands Slater a single cash bill, and recieves no change.