When Justin says "Whats eating you" in the morning scene with Gina it is in reference to the original Jeppers Creepers tag line "Whats Eating You"
Darry's mustard yellow jumper is a tip of the hat to Justin Long's Bannon yellow top.
Johnny is named after Jonathen Breck.
Breck is named after Jonathen Breck.
The film is filled with Jeppers Creepers references.