 At the beginning, when Rodney is building his own robot in his room,  we can see on the wall a poster that says: "Rock Em Sock Em IV:  Red VS Blue" with a picture of two boxing robots. This is a  reference to the Rock Em Sock Em toys, as well as to the film  _Rocky IV (1985)_ (qv) (in which Rockys opponent is a Communist,  i.e. "red"), and also to  _Red vs. Blue: The Blood Gulch Chronicles (2003) (TV)_ (qv) made  with the Halo engine.