You can actually improvise a lot as a voice actor. It's not that entirely different than shooting a live action movie; the characters mouths are quite easy to manipulate once all the information is built into the computer. So you can improvise a lot and it doesn't matter really how far along they are in the process they can really just make the character say something different.
Seth RogenI think people do get better as the movies go on sometimes, and I'm always happy that we're shooting out of order, so it's kind of scattered throughout the movie, and there isn't like a clear build in everyone finding their characters.
Seth RogenI feel much more comfortable as a writer than an actor. I feel like I am a much better writer than I am an actor.
Seth RogenI'm intimidated anytime I work with someone who's directly outside my very insulated group of friends.
Seth Rogen