I cannot find the time stamp but be in the lookout for at the beginning of the movie, the moment when Marty travels to the future (2015). He arrived to the same town square and looks around in awe, but because this is the future there’s an unexpected holographic Jaws billboard doing a jump scare as a joke while the classic Jaws song plays in the background. I never build the courage to look at it, but both my mom and Marty say it looks fake.
Yes. They briefly show a woman topless on a magazine. First Biff flips through it in the school and then Marty picks it up later. The magazine is called Oh La La.
There is also partial nudity (artwork of topless women, artwork of women in lingerie)