 When Rodney first starts fixing the outmodes (after "Who wants to  get fixed?"), the 3rd robot he works on (5th in the overall fixit  sequence) is a reference to the childrens game "Operation". Just as  in the game, when Rodney is taking a wrench out of the characters  left leg, he touches the tool to the rim of the hole; when he does,  the "patient" robots nose lights up & theres a background buzz.