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 RogenIt always seems crazy to tell people what to expect. That never works! So, I don't know what to say, other than that they can expect me.
Seth RogenI liked actions movies. Jean-Claude Van Damme was a major influence on me at that point in my life.
Seth Rogen