I had a couple of those, first a 35" or 45" sony, iirc and then my father in law's 55" (?) monster.
Especially on the first one, the hardware handled an insufficient number of simultaneous colors (think back to 8 bit video cards).
So watching football, most of the colors would get used on the first couple of lines. After that, it needed to use the nearest available green for any more it hit. So I would end up with huge lines separating patches of monochromatic green, looking like a video game rather than a real picture.
(still a good enough picture that my cat would sit and watch, wanting to pounce one of the players . . .)
Much better on the later television, but it had a 700 line screen, so it had to extrapolate from the 450 or so out of the 525 that are actually broadcast with picture, and the jaggies were more pronounced than the mere color artifacts . . .
hawk