The boom mike operator on the movie shoot is wearing a baseball cap that reads "Nostrils." The Nostrils were a British football (soccer) team from 'Phineas and Ferb.'
Tobias Trollhammer is voiced by Scandinavian actor Peter Stormare. Trollhammer is, apparently, Scandinavian as well since he seems to know a lot about the folklore of that region. Trolls (as in "Trollhammer") also feature prominently in the mythology of Scandinavia.