In the episode Send in the Clones MCC stands for Megalithic Cable Company. Johnny accidentally goes in the wrong MCC office, which in this case stands for Maxie's Cloning Clinic.
Bunny: It's so nice to have my Johnny back home...at least I think it's my Johnny.
Johnny: Mama! I got my head stuck in the pickle jar again!
Bunny: That's my Johnny!
Marilyn Monroe:
In the episode Yukon Yutz, when Mama Bravo mentions that after her surgery she'll look like a movie star, Johnny imagines her wearing a white dress being blown up by an air vent, while she's trying to keep it down. This is an allusion to actress, singer, and model Marilyn Monroe (June 1, 1926 – August 5, 1962).
In the episode Send in the Clones, Johnny is seen watching a show called "Lady, the kick-boxing Collie" on TV.
This is a parody of the famous TV show Lassie, which first aired in 1938.