Andrei Rublev
A poster of Tarkovsky's 1969 film "Andrei Rublev" is seen on a wall. "Mirror" thus forms the third part, together with Tarkovsky's previous film "Solaris" which was made in 1972 and which references Andrei Rublev by having an icon made by him being placed in the main character's room, in a series of three films by Tarkovsky referencing Andrei Rublev.