Sorry if this has been noted before, I couldn't read through the entire 76 page thread...
I've just watched A Matter Of Perspective as part of the rewatch that some of us are doing. Were they unable to find some of the original footage? The bit where Riker gets up and circles the facsimilie of himself on the holodeck looks suspiciously SD.
This was most likely an anamorphic shot that had to be zoomed, thus losing some of its clarity.
More info on the process here: