Went through the thread. Thought of a couple of others.

Airplane - While examining the sick woman, Leslie Neilsen does a stiff egg from the mouth bit.

Rio Bravo - (John Wayne did three "Rio" films, if I got the title wrong, I'm thinking of the one with Ricky Nelson and Dean Martin.) The gambler "Feathers" is showing the bartender a color change with the deck of cards. It's obvious that someone is feeding her the cards under the table and her hands are very stiff during the exchange. The bartender says; "How did you do that?" and a'la MST3K, I had to respond; "Very badly!"

Nashville - This is Jeff Goldblum's first film. He plays a drifter with no lines (feel free to correct me if I'm wrong, I've only seen the film once.) who does a salt pour at a diner.