Well I suppose this was bound to happen (should this be combined with the grappling hook etc. thread?).

I’ve seen the film four times. Each time it was the same. The first two things you mentioned never happened (in your mind those scenes probably felt longer to you the first time just because you had never seen them before). The third thing is in the film (you can hear Luke’s scream as the Cloud City hallway falls apart… I think). The fourth is definitely not in the film (you’re right you’re conflating it with something you read after, that info comes from the visual dictionary and has been all over the web).