The writing on the blackboard appears before Miss Choksondik has even written it.
Mr. Mackey's glasses do not have the part that goes over his nose unless he is looking sideways, then it suddenly appears.
Mr. Mackey confesses to Miss Choksondik that he doesn't have much luck with women and that he hasn't had sex since he was 19, which was 21 years ago. However, Mr. Mackey is shown to regularly engage in sexual acts with Mrs. Cartman in prior seasons. He is seen groping Mrs. Cartman from behind while she's on the phone with Eric in Cat Orgy (1999), in which she clearly approves. He also appears in a sex tape with her in Something You Can Do with Your Finger (2000).
Sally is the student who mentions the Filthy Sanchez, but Mr. Garrison calls her Flora.