I can’t recommend the channel Good Bad Flicks enough, in particular the “Exploring…” videos in wich they pretty much compilate all the available information on genre movies’ behind-the-scenes.
Their regular reviews also have a section about the behind-the-scenes near the end.
It’s quite an experience learning about all the thought and effort that goes into making even movies one never thinks much of and that may not end up becoming the hits they deserved to become, at least at the time.
I think my favorite of their videos is ”Exploring Razorback - The Best Looking Movie About a Killer Pig”, or as I like to call it “the story of one of the best music video directors ever wanting to take a break by improvising a dream-like visual feast of a movie about a giant monster boar in Australia”. I never said I’m good at coming up with titles.
Good Bad Flicks has some riffs in the reviews but always shows respect to the films and will go into what worked and what didn’t work. Its not like trash like Nostalgia Critic, Cinema Snob or Brandon’s Cult Movie Reviews that just riff films, regardless of quality, for a few cheap laughs. Usually filled with juvenile gay jokes, sex jokes or shit jokes.
My favorite review is their video on “Dog Soldiers”.