that the movies you recall as being B&W were originally watched on a B&W TV.

I saw Wizard of Oz in a theater before TV. It was released annually on some occasion, probably Christmas. The first segment has always been B&W up to the point that Dorothy lands in OZ and exits the house to a world of technicolor. When she returns home it goes back to B&W. Of course if you watch it on a B&W TV that transformation never happens.

The first color TV broadcast I saw was the World Series at a restaurant about 1959. I didn't own a color TV until about 1966, so. I watched a lot of color broadcasts in B&W.

The first colorizing was horrible not much better than those ridiculous tinted screens that some used before color got affordable. They have gotten pretty good at it now and shows like WWII In Color (combo of rare color footage and colorized) are pretty damn good.

This is getting off topic, but not many recall how expensive TV (tubes and all) were in the 50s. The first TV I ever bought was an 19" B&W portable from Sears in about 1959. I cost me about 150 bucks. That would be at least 1500 in today's money.

My TV was considered a portable because it had a suitcase handle on top but it weighed at least 35/40 lbs. My family had TV with 3 channels (2 vhf and 1 UHF with terrible reception) from about 1952 on with an outside antenna that had to be manually rotated when the channels were changed.

Weird remembering that stuff.

As for dreams, I occasionally have a sense of vivid color in my dreams but usually they are without color or more accurately without any particular sense of color. I don't think of it as dreaming in B&W, more like very subdued color.