When Al mentions that his stepson always wants to watch the Pitch Perfect movies, everyone reacts negatively. That includes Larry, who's played by Donald Faison, who appeared in Pitch Perfect (2012).
The school psychologist is named Dr. Farrow, which may be a call out to Mia Farrow who starred in Rosemary's Baby, another film about a woman who is seduced into bearing the antichrist for a satanic cult (and whose story closely parallels what Samantha tells Gary in this film about Lucas' conception).
When Al is telling the group about his stepson he says, "Let's put on some Rush. Put your hand on a speaker, your hand on your heart, see if you feel something. I said, 'What are you feeling?' He said, 'Nothing.' I said, 'That's America.' He didn't get it." The joke is that they're a Canadian band.
Eli Craig: The film's writer and director plays the person with the clipboard in the final soapbox derby scene.