The blue door in the background which looks suspiciously like TARDIS was a coincidence noted during filming.
Master When's sonic plunger has a sticker on it, which says "8". Mykola Yeriomin's favorite Doctor, who served as a basis for Master When is Eighth one, Paul McGann.
The sound of S.O.R.T.I.R. appearing is a sound of toiler flushing slowed down. "Sortir" is a slang word for "toilet" in Russian and Ukrainian.
Master When's leather gloves are made by Jeronimo, while Eleventh Doctor's catchphrase was "Geronimo!".
Mykola Yeriomin: [multilinguality] Main bulk of the episode is in English, but abbreviation "S.O.R.T.I.R." is based on a Russian word and there is also a background sign in Ukrainian.
Mykola Yeriomin: [titles and credits] Main titles credits are stylized and parodying assortment of opening sequences of Doctor Who (1963), Doctor Who: The Movie (1996) and Doctor Who (2005). Instead of main cast it credits Askold Tutylopydirskiy as someone who "has nothing to do with" the series. End credits begin with "Next Episode: May never happen" message, are modeled after Doctor Who (1963), and are crawling on time vortex footage background.
Mykola Yeriomin: [Askold Tutylopydirskiy] credited in main titles as having "nothing to do with" the episode.