When Chris Vaughn sees his old friend Ray Templeton (Johnny Knoxville) for the first time, Vaughn calls him "Ray Ray," a reference to Knoxville's role as Ray Ray Perkins in "A Dirty Shame."
The scene where Sylvia is doing the Hokey Pokey and squats down on a water bottle -- in "Carmen, Baby", Carmen is dancing on a table at a party and squats down onto a tall bottle, much to the delight of most of the other party goers. Knowing Waters as a fan of Radley Metzger, this can't be coincidental.