Cast Incest: Gail has a relationship with Gordon during the time the group moves to Malibu. Mary Steenburgen (Gail) played the mother of Will Ferrell (Gordon) in Stepbrothers. Furthermore, she plays his step-mother (the wife of his biological father) in Elf.
The Cast Showoff: Mary Steenburgen really plays the accordion. Which is why Gail is frequently seen playing it.
The Danza: Mel Rodriguez plays Todd Rodriguez (last name mentioned by Phil in "The Big Day").
Dyeing for Your Art: Will Forte really did shave half of his head for a season. Mel Rodriguez also followed suit, though for a shorter time.
Enforced Method Acting: Kristen Schaal ate about 50 real crickets on set because nobody told her they also had fake ones made of candy.
The Miller brothers (Phil #1 and Mike) are played by former Saturday Night Live cast members Will Forte and Jason Sudeikis, respectively.
One of Pat's men (Darryl) is played by Jon Hamm. He's the one who gets shot and killed by Melissa, played by January Jones. So basically, Betty Draper just killed Don.