There is a certain cinematic tradition of in-jokes, when directors and even whole studios exchange multiple references, cameo appearances and in-jokes. PP Studio, due to friendly relations with many other production companies around the world also engages in such friendly exchanges, which are listed on this page.
In return Andreev quoted "But first, main titles" bit in the pilot episode of his series "Plagiat ili bezdarnost'", "Shkolota predstavlyaet:S.T.A.L.K.E.R,Neznakomets" (2016), additionally using a shot from The Wild Spirit (Dikiy Duh) (2012) in the prologue montage.
Nikolay Yeriomin in exchange referenced both Merser and her Ugolok Kinokrotika in PP Studio short film What Worth Are 50 UAH on Khreshchatyk? with both being seen in surveillance control list of The Housekeep System. Merser is also thanked in special thanks of the short twice and "Ugolok Kinokroika" is misspelt as "Ugolok Kinokrtoika". At least one of those mistakes was noticed in post-production but was left unedited on purpose for additional surreal effect.