Did anyone notice that the Doctor was wearing an earring at the end of the episode? When did she pierce her ear? Did she regenerate with the piercings? Not complaining, just fun to point out little things like that.
I did not notice that. Are you sure her ear was pierced? Aren’t there earrings that work without a hole in the ear?
There are, but it was.
However, the Third Doctor suddenly had a tattoo after regenerating from the Second Doctor, and I believe there’s been at least one Doctor that had scars the previous Doctor didn’t display (like Smith if I’m not mistaken).
So there’s some precedent for cosmetic differences through regeneration such as pierced ears.
Also I can’t recall exactly, but don’t feel like looking it up - but didn’t Capaldi have pierced ears (or at least one), he just never wore any ear jewelry on the show? It wouldn’t be out of character for Capaldi, who was something of a rocker and a rebel in his youth.