After Ralph is announced the winner and Lisa and Alison are walking out of the school, we see the flag pole, and a tall dark green bush after some smaller lighter green ones. But as Lisa and Allison walk passed those in a close-up shot, the flag pole is gone, as well as the tall dark green bush is gone.
When Skinner pulls the sheets off Ralph's diorama to reveal the Star Wars action figures, the packages are standing at an angle three to a row with three rows, with the sides beveled. The shot cuts to Skinner asking about them. when it cuts back, all three rows are now faced and there are three extra action figure packages lying flat in the cardboard case.
Allison Taylor occasionally appears in later episodes as a background character, usually silent. She never has any interaction with Lisa even though they were good friends at the end of this episode.
When Marge tells Homer about the plant saying not to bother coming in on Monday if he doesn't come in the following day, he refers to having a 'four day weekend' when misinterpreting the threat of dismissal as an invitation to take those days off. It would actually be a five day weekend as he wasn't in that day either.