In some scenes you can clearly spot that they have been filmed in Malmö, and not in Stockholm where they supposedly take place. For instance are the public transport buses not in "Stockholm" colours and in another scene there is a phone number visible on a shop window, which has the Malmö prefix.
The scenes that are supposed to take place in the flat in Stockholm, must have been shot in Denmark, as the electrical switches on the wall are clearly of the typical danish brand "FUGA".