Dooley, a depressed friend of The Gang who committed suicide in previous episodes like "Dennis and Dee's Mom Is Dead", was mentioned in this episode while he was skating off camera.
As Charlie skates through the rink he tells skaters to keep it clean and addressed a child named Richie Keen, saying "Richie Keen, keep it clean." This is a direct nod to the director of the episode, Richie Keen.