I will say, the colors chosen for the set do make it look a bit like a colorised photo now. Though it's hard to say how much of that is the original color on set and how much was lost to the camera back then. It was tough to light/balance stuff well back then. Especially if they changed cameras, or if the set was made with a different camera in mind either way.

Behind the scenes footage always looks different back then from what aired. Not just from lack a of post-processing, like it would now, but also a lack of "pre-processing", lol.