On topic with the original post, I’ve never noticed the retraction sound in Despecialized. And I look for it every time, so it’s not like I’m not paying attention.
Is the missing frame in the shot where Han says “No! This one goes there, that one goes there”, right? It starts at ~29:30. That’s the only shot I could find that resembles Han preparing the falcon for evacuation, with fast-moving rebels. But I couldn’t see any missing frame while watching.