It looks great on a modern (https://www.metv.com/shows/charlies_angels_1976) a high def TV. Was the show originally shot on film? Was it remastered?

I haven't seen it in a while but I see the commercials for it all the time.

It looks great on a modern (https://www.metv.com/shows/charlies_angels_1976) a high def TV. Was the show originally shot on film? Was it remastered?

Yes the entire series was remastered exclusively for airings at the time for the HDNet launch network along with "Hogan's Heroes". Both series ran for over a year on at the time the first all 24/7 hd network then owned by millionaire owner of the clippers whom current name escapes me.