The entire film was shot in the apartment building where the director and the producer used to live.
James' apartment was the Director's apartment and Emma's apartment was the Producer's apartment.
In post-production the film turned out to be 20 minutes longer than what it had to be. The Director, the Director of Photography and the Editor had to completely redesign the story.
Nobody knew how to do it till the director came out with the new ending, losing 20 minutes of the original cut the film manages to be 10 min.
James' shirt was made 10 minutes before shooting, that because someone from the Art Department (No named in the crew list) forgot the original shirt.