Where are these guys?
The actors playing Patrick, Henrik and Kristian have no other credits after 1987. Isn't that surprising?
So much to see, so little time!
Yes, It's a bit strange that they never did anything after this but in other ways, no.
1) Copenhagen is not a big film city and opportunities are probably pretty limited.
2) These guys had a great look as school kids but that may have changed.
3) The film was written and directed by the same guy. These are most likely not professional actors though they did a great job here.
Yes I agree. Another reason could be that they have worked in Danish or other European films which typically are not all listed on Imdb.
So much to see, so little time!