I've got a good source for anyone who wants to do more research on this (including Bob, if need be):
TV Tropes: History of Hollywood
Yeah, it's TV Tropes, but it basically covers everything that Bob's going over concisely and clearly, along with everything else that he couldn't fit into a five-minute video.
Side note: Yeah, I wrote a large amount of the stuff on that page and its sub-pages. Feel free to take it with a grain of salt.