As is often the case with conventions, Adult Swim held various press hours for their shows, including a Venture Bros.
one with Jackson and Doc. I attended it and will have a write-up a few days, but if you want to watch the entire thing then check out the first part
and the second part
thanks to Anime For Dummies
You can also click through to view them embedded if you prefer. Thanks to ZJS in the comments for posting these.