This is the first of five Christmas-themed episodes in the series.
Howard: Why is it this car only picks Sundays and holidays to get sick?
Richie: (referring to Fonzie) He was alone in the garage eating ravioli out of a can. Now, what kind of a way is that to spend Christmas Eve?
Marion: What would we do without you, Fonzie?
Fonzie: Well, you'd be up a creek, Mrs. C.
Richie: Yeah, our car'd be stuck in the snow, our tree'd be out, and our Santa Claus would be mugging the neighbors.
Howard: We're gonna have fun. Look, we'll, we'll pop popcorn, and we'll toast the marshmallows, and we'll drink some cider and trim the tree, and then, later on, I'll read The Night Before Christmas.
Joanie: (singing) Jingle bells, jingle bells, boring all the way.
Howard: No singing at the table, Joanie.
In the first scene at Arnold's, Henry Winkler originally says, "I'm leaving tonight on the five o'clock bus," but his voice is later dubbed to say, "I'm leaving tonight on the four o'clock bus."
This episode is also known as "Guess Who's Coming for Christmas."
This is Randolph Roberts' last appearance as Chuck although the character is mentioned again later in the season.
When this episode was rerun in 1975 and 1976, there was a newly-shot introduction where Fonzie prefaces the story mentioning that Chuck was home for the holidays in the process. This is the only time that Chuck was referred to in the third and following seasons. It was re-capped/re-run twice with a Pat Morita (Arnold) episode and an Al Molinaro (Al) episode. Some packages sold to international markets show the recapped Al version in place of the original episode.
This episode features the first shot of Fonzie's apartment.