During an appearance on Conan O'Brien, Charlie Day commented on Danny DeVito's open-ness to performing almost every depraved act that the writers ask him to do. When asked if DeVito had ever said no to any idea that Day and the cast had, he commented that for an April Fools Prank, they wrote a script for an episode which consisted entirely of DeVito's character getting raped when sent to prison by various gangs and then the guards. Day claims that DeVito didn't reach the end of the script because he had refused outright and even contacted his lawyer.
In the two-part season finale of Season 7, it is revealed that Mac's real name is Ronald McDonald.
Mac's dance pose where his shirt is open and blowing in the wind is an homage to Michael Jackson.