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.
In this episode, Kelly states that there are 7 kids in the Kapowski family.
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.
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.
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.
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?
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?