I even remember the movie ‘A Series of Unfortunate Events’ in the theater and the boom mic kept dropping down into the picture all throughout the movie. Then on the DVD release, they must have digitally removed the boom mic as I didn’t see it drop into picture like in the theater.
Wasn’t sure if this was answered yet, but that was because the theater had the wrong mask/lens setup. It has been known to happen, but I’ve never witnessed it. Same thing can happen on movie home releases if they screw it up.