It's already been seen in a still image (and in an advert for batteries of all places!), but this is our first proper, live-action, in-universe look at C-3PO in The Force Awakens, complete with his shiny new limb. Once again, and more-so here because it's the first time we've really seen it, what exactly happened to his arm? Was this before the events of The Force Awakens, or something that happens to him within the movie itself (it wouldn't be a Star Wars film without a little loss-of-limb action now, would it)? It's also interesting to note that he's with Leia at this point, suggesting the droid is very much working for the Princess (or Queen, or whatever title she holds now) in this movie - but R2-D2 doesn't appear to be with him.