The title of the movie was a phrase director Lukas Moodysson wrote on the first page of his script. Somebody noticed it sounded like a good title and Moodysson used it officially as the movie's title from then on.
The original script ends with Agnes and Elin walking away holding hands. The final scene in the movie was thought up by the production lead and written by both Lukas Moodyson and Alexandra Dahlström, long after shooting had begun.
The poster for the film featured quotations from the dialogue, including four-letter words. This caused some controversy, so for Stockholm's subway, special posters were printed with the "worst" quotations left out.