Ronster said:

The R2-D2 scene on cloud city really perplexed me after ryan pointed it out....

I had a proper look at it tonight and it's not pretty... But actually no shots need flipping at all but to fix it so that it makes sense here is what I come up with...

Yep I am terrible at art but you could treat it as if R2 moves while Lando is tugging leia so this happens off screen... But in my mind to show R2 already there or moving in that shot would help fix it but that is perhaps where it gets ugly or difficult to do.

Although the way I presented it is funny it is a serious idea for a fix... My art is appalling have a laugh I don't mind I accepted it a long time ago.

But the trajectory of R2 should be coming more inside the door again as Leia shoots and runs.

^ Fair play to ya, in all seriousness that looks as good if not better than SE changes like digi-Jabba.

^ If R2 started rolling inside the doorway this would fix it but bloody hell it would be a hard FX to pull off.