The various diplomas in Doctor Humfrey's office are from Raimi University, Romero Community College, Carpenter College, and Landis University. This is a tribute to Sam Raimi, George A. Romero, John Carpenter, and John Landis.
Even though never explicitly stated, the film takes place in autumn of 1988. There are several allusions to this fact, the biggest of which is the mention of the release of Super Mario Bros. 2, which was released in North America on October 10, 1988.
David's original last name was Whitmere. It was changed to Whitman however, when James Andre asked for the name to be changed out of respect for a friend named David Whitmere.
Director RJ Cusyk has stated on numerous occasions that the color of the blood is intentional. He used the bright red to pay homage to giallo films from the 70s and 80s.
David and Jonathan are named after the Biblical figures David and Jonathan.