Mikhail Bondarev's favorite Christmas/Winter Holidays movie mentioned in the main titles is Ivan Vasilyevich Changes His Profession (1973). Although not a Christmas or New Year movie per se, it is often shown on holiday season on Post-Soviet television.
On 01:30 a single-frame insert of the same location which is seen later in the end credits is seen.
Originally, Mykola Yeriomin's character Alfred Bergman (also known as Eldar) was going to be in the episode (in Leonid Syplyi's draft of the script), but he was by Konstantin Kannskiy in his scene, because Mykola Yeriomin was not pleased with the idea of having too much screen time for an uncredited director's cameo.
Mykola Yeriomin: [multilinguality] While the main bulk of the episode is in Russian, there are a lot of Ukrainian writing in it (mask's label and the poster)and there are also built-in English subtitles.
Mykola Yeriomin: [Askold Tutylopydirskiy] is credited as Mr. Sipliy's (Leonid Syplyi's) make-up artist.
Mykola Yeriomin: [Communal Universes] apart from assorted credited main cast characters Avraam Bondy and Dyadya Vasya (Uncle Vasya) appear briefly in the post-credits scene. Also appearing are a fictionalized version of Mikhail Bondarev, Innokentiy Zibrov-Zadunayskiy, while Askold Tutylopydirskiy and Mr. Keychain are referenced in the end credits.