In an interview with The Guardian Nick Frost (Hot Fuzz, Shaun of the Dead) spoke a little about working on The Adventures of Tintin: Secret of the Unicorn with Steven Spielberg and Peter Jackson.
Nick finds acting difficult because he doesn’t have the back-up of training. On the Tintin film, the script kept changing, to such an extent that he and Simon were sometimes handed their words just minutes before they went on. “I need a week to really get a scene into my head. And you’ve got Steven Spielberg and Kathy Kennedy, who’s the most powerful woman in Hollywood, and Peter Jackson, who’s co-directing from New Zealand using iChat! It was the most stressful thing I’ve ever done. Having said that, Spielberg was amazing. Sometimes he’d run on at the end of a scene and do a little dance and punch the air.”
Spielberg recently finished the performance-capture stuff and Peter Jackson is now working on the special effects for 18 months with WETA in New Zealand.