Did your girlfriend’s parents have a color TV as a bonus (as I know that show was made in color)? I remember being told color sets were for fairly wealthy people until about the mid 1970s?
Color Televisions were damn expensive, and most programming didn’t broadcast color until 1966 or 1967 or thereabouts. Bonanza was one of them, and to show it off they always had lots of color on the set, purple shirts, yellow dresses, green pants etc. I would say a Color TV was definitely a middle class thing until the early 1970s, yes.
I had an Aunt, a lefty college professor type, who hated Television. This was old school liberal, not to be confused with modern nutbars, although she was pretty bad. She had a fairly expensive 1960s B/W television, but it was on a cart, and not the centerpiece of her home. She’d wheel it out if there was something visitors wanted to watch, that was well into the 1980s until she died, mostly to watch Football games. I’ve since emulated her strangely enough.
For poor folks the sold magnifying screens with blue, brown and green sections, you placed in front of the TV.