Danny Zucco was also the main character's name in the musical Grease.
Len Lesser - who appears in this episode (but not on screen with Telly Savalas) worked with Savalas and appeared with him on screen three years earlier, in the film "Kelly's Heroes".
Phil Burns played the original character of Jerry's father on Seinfeld. Also in this episode is Len Lesser who played Uncle Leo on several episodes of Seinfeld.