Christmas Day in 1977 was on a Sunday, like on the episode (which was taped in 1977).
The first episode in the series not to have guest stars.
The only Christmas episode of the series.
The full form of Chrissy's name, "Christmas", is revealed in this episode. It is only mentioned in two other episodes: Chrissy Come Home (1978) and Chrissy's Hospitality (1979).
The Christmas Carol that Chrissy Snow tried to sing but got the Lyrics slightly wrong was 'God Rest Ye Merry Gentlemen'