I've only seen the film twice at this point, so I'm sure there are things that I've missed. However, you could say that C-3PO changing his parts is an idea borrowed from the prequels, if it is not strictly a prequel reference. In the original trilogy, C-3PO had one silver shinplate, but, as we all know, he was all gold except for the red arm for most of TFA. When the Resistance is celebrating their victory near the end of the film, he appears to be back to all gold like he was in Revenge of the Sith.
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