When you watch a movie the second time. Do you pick up something you missed the second time watching it?

Usually yeah, cos I know what happens so I'm not so focused on the story and pick up on things I didn't notice when I'm concentrating on following the story

Sometimes. Fight club was a good movie like that for me.

I used to close my eyes at certain parts of movies as a kid so that when I rewatch it I'll see new things.