The names that Martini says during shooting practice are all names of various cast and crew members.
In the truth or dare scene, when asked about his fantasy, Rocky says he fantasized about a girl named Susan Johnson. One of the producers of the film is called Susan Johnson.
When Rory Culkin tries to coax Trevor Morgan to call off the prank, we eventually see 'Josh Peck''s character interrupt him and then scratch his head. Scratching his head was Scott Mechlowicz's cue to say his line.