For Season 13, the filming location of the show was moved to Radford Lot, in Studio City, the same location where Seinfeld was filmed.
In the flashback where Charlie attacks Santa Claus, only the word "retarded" was censored. Glenn Howerton has stated that the use of the word is the only thing he regrets in the whole show, especially in Sweet Dee's Dating a Retarded Person (2007).
At the end of the credits, a caption reads "Subtitle Translation by A. Vandelay," which is another reference to Seinfeld.
In the flashback footage where Frank emerges naked from a couch, part of his body is blurred in multiple shots; in the original S06E13 episode, it is not (on Hulu as of April, 2022).