And regarding threepio’s arm, he has a line (to bb-8 I think) about needing to get his normal arm reattached. Then later we see he has done just that. I agree it’s a little awkward and not very clear, but the pertinent info IS in the film.
Correct, at the point where Leia and Han meet up facing each other, he walks offscreen with BB-8 saying “Yes, I must get my proper arm re-installed”.
It comes across as an off-the-cuff line, and it’s easy to miss as you watch Leia facing Han, but it’s there. And I admit I just never picked up on the fact that he’d gone ahead and done it in that last ‘group’ shot!
However, it still doesn’t explain ‘why’ he had the red arm attached in the first place, so if he’s got it back on at any point during the next movie, I just think it would be quite neat to actually hear the ‘official’ explanation briefly. But if he’s back to the gold one from now on, while it would still be nice to have it explained onscreen, it won’t really matter…as that little snippet of dialogue at least explains the swap by the end of TFA.
(as a little aside, there seems to be a ANOTHER protocol droid very close to C3PO and Leia during that final ‘group’ shot - a RED one as it happens…and if C3PO sticks to his gold arm in future without any kind of explanation about it in the next movie, then I might just as easy imagine that it had something to do with that particular droid, for some unknown reason!)
I return you all back to our regular ROGUE ONE programming.