That's interesting. I was trying to look in to it.
I hadn't noticed.
70's TV like Columbo look OK on flat screen HD., but that's in Colour.
Off topic:
This coincides with something I noticed only a few weeks ago, more related to curved CRT screens and aspect ratio.
A BBC channel were re - running Fawlty Towers from the early 70's. I recorded them on a HDD PVR to watch later.
Notice the set assistant, or whatever title, crouching to I think attach a fake roast duck (iirc) to the foot of Manuel to slip on as he came quickly back through the swing doors.
Maybe we would have seen it if home video recorders were a thing at that time. They knew they would get away with it for a split second on a broadcast, or else CRT TV's would not have shown that area.
