In all previous episodes, Vanessa Redgrave narrates the opening and closing sequences as the 'Mature Jenny' character in voice only. In this Christmas special, she plays the part in person.
Musquash is another name for muskrat.
A Dansette is a brand of portable British record player that was popular in the 1950s and 1960s.
Patsy and Camilla work together at the lodge. Patsy is played by Emerald Fennell, who played Camilla Parker Bowles on The Crown (2016).
Kacey Ainsworth, who plays Nancy in this episode, played 'Little Mo' in Eastenders from 2000-2006, alongside Cliff Parisi (series regular and handyman, Fred) who starred as Minty in Eastenders from 2002-2010.