'What Happened to Monday' trivia and fun facts

Production

Shot entirely in Romania.

Subtle joke

The main characters named after the days of the week share the identity of Karen Settman. In Italian "week" is "settimana". This hasn't been directly acknowledged but could be a subtle joke.

Blacklist

Original script by Max Botkin was on the 2010 Blacklist of best unproduced screenplays in Hollywood.