Notice the main 'villain' in the movie, (the Warriors Captain) Tom Riley, has the same last name (but different spelling) as Gordon's old peewee coach Jack Reily, the main 'villain' in the first movie.

The actor who plays Coach Wilson (the Varsity coach) in D3 also played a Goodwill Games referee in D2. I am not sure if he is meant to be the same character or not, but it is definitely the same actor: a man named Jack Whyte.

One of the Eden Hall teachers, Mrs. Madigan, was played by Claudia Wilkens, the same woman who played the school principal in the first movie. The character might be the same or not, but it is definitely the same actress playing both.

When Charlie and Fulton go to the amusement park, an arcade attendant jokes with them about playing hooky. The man who plays the arcade attendant in this movie also played an unnamed celebrity at Coach Bombay's party in D2, and the same man played a lawyer in the first movie. He also happens to be the movie's screenwriter, Steven Brill.

The actress playing Connie has the same surname as her character - Moreau.