Oh yeah, I have a family member who watches these old TV series, and the increased fidelity of TV broadcasts today makes so many fake props blatantly obvious. For example, at about 24 seconds into the intro to "Green Acres", you can see quite clearly that the background is a painted backdrop: https://www.youtube.com/watch?v=DrbPAt1_vc4 ... If you watch an actual episode of the series they use these painted backdrops with quite some frequency.