Fun fact: the guy who plays Stu is actually an IT guy who's friends with Taika. He didn't know he was going to have such a big role in the film. He thought he was being hired to do IT work for the movie and have a small cameo. Also, while Taika and Jemaine (the writers/directors who also play Viago and Vlad respectively) wrote a script for the movie, they didn't show it to any of the actors, so a lot of the dialog was improv.