Most Likely to Succeed -- NOT
When they are showing scenes from around the school at the beginning of the movie, there is a "Most Likely to Succeed" plaque from the past. If you look closely, you'll realize it's the actor that plays the Janitor, only younger.
John Hughes Cameo
At the end of the film when everyone is being picked up by their parents, Anthony Michael Hall is picked up by John Hughes (Writer/Director).