Stan borrows the DVD from Max to watch it.
The scene where the big truck "threatens" the car
The two men catch a shark, and then when they pull into port they are singing "Show Me the Way to Go Home," which is what they sing in 'Jaws.'
The same head phone gag from Mystery of Mamo is used in the film.
Naomie Harris is kissing Woody Harrelson wherever he says it hurts on his body, and keeps pointing out new places. This happens exactly the same way between Marion and Indiana on the boat.