Continuity mistake: When Cory and Topanga are kissing and he puts his hand in her shirt, she stops him and says "what did you think was going to happen tonight?" Then she puts her hand on her lap. In the next shot, her hand is back on his shoulder.
Continuity mistake: At the end of the episode, when Cory and Topanga are kissing, Shawn says "Hey, I'm talking to you", hits Topanga on the arm and her hair gets messed up. When the shot changes to a wider view, her hair is not messed up. The position of Topanga's arms wrapped around Cory also changes.
Continuity mistake: In the beginning of the show, Cory is showing Shawn something he wrote in the school paper. Cory walks away leaving his backpack on the bench. In this whole scene to the point where Cory says, "Is it just me or is it just me" sometimes he is wearing his backpack, and sometimes he isn't. (00:00:20 - 00:03:05)
Chosen answer: In the present day, with the United States abiding by more stricter school health laws, for the most part this wouldn't be in school cafeterias as many cannot even have carbonated beverage machines now. However, in the 90s when the show takes place, it wasn't unheard of for there to be coffee machines in the cafeteria of small schools where the teachers eat with the students as we see them do often in the show. The idea being that the cafeteria was small enough so a teacher or hall monitor could catch a student before they could drink the coffee.