The opening scene and the music is a reference to the 1932 Disney short, Flowers and Trees. The music that plays in the scene is from the "William Tell Overture" by Rossini.
Roger's bounty hunter montage consists of
Boba Fett from Star Wars
Greedo from Star Wars
Predator from the Predator Franchise
Dog the bounty hunter, alhough Roger calls himself Horse Renoir.
Roger attempts to free himself and Stan by setting the barn on fire, after "seeing it in a movie." This escape is reference to Indiana Jones and the Last Crusade, when Indiana and his father are trapped by the Germans; however, Roger apparently did not realize that in the movie, the room was set on fire after they attempted to burn the ropes with a lighter.
Steve's psychic powers are a reference to the film The Dead Zone, with his hair mimicking that of Christopher Walken's character.
Jeff's criminal number is 7OU81215, which incorporates Van Halen's album OU812, pronounced as "Oh You Ate One Too."