I rewind if I miss something. Be it what was said, if there was something I didn't catch in the background, subtle clues. I've been known to rewind even after I've watched it before. Sometimes that second time around gives new insight into the whole series.
What about you? Do you rewind a show or movie to see something you miss?
I rarely go back unless I'm REALLY into the show and I feel I missed something important. Sometimes if I let it continue to play I'll find out anyway what I hadn't been paying attention to earlier.
Only when I don't understand the scene. Like Black Adam. There was one place we didn't understand, so we rewinded it. I won't spoil it, but its towards the end.
It is very rare that I will rewind back on a TV show unless I miss something or someone I am watching the show with misses something that I point out and they want me to go back a little to see what happened and what they missed. If I can avoid going back in a TV show I will as I feel going back sometimes throws me off in what is going on in the show.