Why not Seether at the Movies? Or spice it a little bit and go with Seething at the Movies.
I don't know how you're going to approach the channel, but maybe The Movie/Cinema Snob or Motion Fricture (a play on motion picture). Fricture is not exactly a word, but it's derived from "fricturus", which is Latin for "roast". But again, I don't know if that's going to be your approach.
Of the names you listed you could combine "cinema" and "mondays" to create "Cinemondays". For "The Final Credit" you could go with "The Movie Coda" instead since that's also another way to refer to a post-credit scene, although it doesn't really roll off the tongue. Another name I think would work taking "Popcorn Palace" as reference is "Spill the Popcorn", as a play on "spill the beans".
Other names that come to mind are Cinema Bloke, Cine-O-rama, Screenjab, and Flickdom.
Or based on your avatar, why not Foxinema?
