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Follow that other thread on flagging. In summary, sets made before VCRs came into use have slow horizontal AFC to reduce the effects of noisy (snowy) signals, but don't respond well to the timing jump at the VCR head switch point. Later sets had the time constants reduced so the flag waving would die out very quickly while the scan was still above the top of the visible raster (but horizontal sync then had more jitter on noisy off-air signals). It is possible to change the time constants in an older set to be more like a later one and get rid of visible flagging.
Whether you get a lot of flagging or a little from a particular tape is totally at the mercy of how tightly it was stretched over the head drum when recorded and how tightly it is stretched when played back. The mistiming jump can vary anywhere from zero to 1/2 a horizontal line.
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