As I said, it has to be a Shining-style gaffe where a particular HSL range was seemingly adjusted to different values, and it altered everything in the frame with those colors.

I still can't fathom why this would happen - could it possibly have been an attempt to hide some kind of emulsion damage that just happened to be on top of something pink/red? I am noticing that in the example from The Shining, it's green stuff getting changed to pink, and in BTTF it's yellow getting changed to pink. (Again, look how the yellow road stripes in the background also got changed to pink.) Whenever I see emulsion damage on a print, it always seems to be green or yellow - maybe that's it?