Factual error: Paul and Kevin go to the book store to buy "Everything you always wanted to know about sex." In this episode it was still 1968 but the book was not released until 1969.
Continuity mistake: When the gym teacher is drawing on the chalkboard, the kids ask him to draw the whole woman. He does, and the word "ovaries" that he had written disappears. It reappears differently in a second cut.