In one scene, you can see Dean reading Tales of the Teenage Mutant Ninja Turtles #7 volume 2. The director Bjarni Gautur is a big Ninja Turtle fan and tries to make a reference to them in every movie.
The character of Dean is named after Dean Clarrain who did most of the Archie Teenage Mutant Ninja Turtle comic books, but those comic books but Bjarni Gautur interested in storytelling, both comic book and movie-wise.
The kids in the movie are from Tromaville. The fake town created by Lloyd Kaufman and his company. They are credited as inspiration for this movie.
Gunnar Hansen was originally going to play the Crazy Icelander, but when he got too busy with other projects, the role was given to Thomas Björn.
Bjarni Gautur was hoping to have Quentin Tarantino and Eli Roth in a quick cameo when they arrived in Iceland, however, the movie was finished when they arrived.