One of the students is wearing a Guns N' Roses 'Appetite for Destruction' T-Shirt.
Astrid Schabl who plays the "Teacher" was actually teaching a theatre class at the school the film was shoot at. The filmmakers found her while scouting locations.
PAUL's school's name is "BG BRG Bundesrealgymnasium Metternichgass 12". "Metternichgasse 12" is the actual address of the film school in Vienna, that the filmmakers attended when they produced their film.
"Ketchup Kid" was Finn Bachmann and Matthias Hecht acting debut.
Matthias Hecht ("Aleksandar") was originally supposed to play one of the bullies. But when, just days before of shooting, Aleksandar's original actor dropped out due to personal reasons, Hecht applied for the role. Being skeptical at first, the filmmakers let Matthias Hecht audition again. His performance and motivation was so extraordinary that the filmmakers re-casted as "Aleksandar" him right away.