The Elementary Particles

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• Oskar Roehler had worked on the script for three years before he started shooting the film.
• Director 'Oskar Roehler' originally offered 'Moritz Bleibtreu' the role of Bruno, but he turned it down because he thought the role of a sex-addicted loser looked too much like his role in Roehler's previous film 'Agnes und seine Brüder (2004)'. Roehler gave Bleibtreu the role of Bruno's half-brother Michael instead, casting 'Christian Ulmen' in the role of Bruno. Late into the rehearsals, four weeks before shooting, Bleibtreu and Roehler decided that Bruno would actually be a better fit for Bleibtreu and so Bleibtreu and Ulmen switched roles.
• Movie Goof (errors made by characters, possibly deliberate errors by the filmmakers): The first letter talking about the move to another grave of the brothers' grandmother says she has to be moved due to the construction of "Bundesstraße 17". Later the gravedigger says it's about "Bundesstraße 7"
• Movie Goof (revealing mistake): In the scene where Christiane is waiting for Bruno's phone call in her apartment, the doorstep onto the balcony is clearly visible. A few moments later when she rolls outside in her wheelchair it has been replaced with a ramp.