Not only the film's plot but also how it was filmed illustrate the classic example from Theory of Games - The Prisoner's Dilemma, because actors were not aware of each other performances, mostly filmed separately.
The very last shot before the end credits is metaphorical image of an exit sign symbolizing the prison break. Accidentally identical sign can be briefly seen in the background in the very first shot after the main titles.
The very last shot before the end credits (metaphorical image of an exit sign symbolizing the prison escape) was actually the first filmed.
Graffiti "Tulpan" which can be seen behind the Detective while he chats with Vito was actual part of location used. It's Russian for "tulip" transcribed in English letters. Also, location used for the shot was actually a floor lower then the one, where Vito scenes were filmed, though in the film itself they're supposed to face each other strait.
Sheets of paper which Detective gives to Bobby and Xander Burchill as their "case" is actually film's hand-written screenplay. Due to lack of time it was only in hand-written form and because of the same reason was also used as a prop.
Mykola Yeriomin: hippie prisoner escorted by a female cop in film's beginning. Also narrates the epigraph and dubs the voice of Bobby.
Mykola Yeriomin: [multilinguality] Film is in English with Italian used for some of the dialogs and there's also a Russian word for "tulip" written in English letters as a graffiti on the wall.
Mykola Yeriomin: [narrator] A character of Detective narrates his actions off-screen in film-noir style. Epigraph is separately narrated by Mykola Yeriomin himself.
Mykola Yeriomin: [epigraph] "In the prisoner's dilemma the two prisoners interact only once". Roger A. McCain.
Mykola Yeriomin: [Sudden Actors] Leonid Syplyi (under pseudonym "Robert Grob"; doubled for Mikhail Bondarev in some scenes), Irina Yuriivna Buchanets and Katerina Levchenko (whose voices are briefly heard in Warden scene) were credited in this section in the end credits.
Mykola Yeriomin: [Scenes of homeliness or cosiness often long-awaited by characters] Despite being locked in a maximum security punishment cell Xander Burchill seems to enjoy a rare moment of normal conversation in his own way.