Rob McElhenney plays Mac only on an HBO series.
 They have two sons named Axel Lee McElhenney (born on September 1, 2010) and Leo Grey McElhenney (born April 5, 2012)
George Carlin headlined the most comedy specials for the network, making 12 appearances between 1977 and 2008; his first, On Location: George Carlin at USC (aired on September 1, 1977), featured Carlin's first televised performance of his classic routine, "The Seven Words You Can Never Say on Television"

