Actually, "Back to the Future Part 3" is the first Hollywood film that I saw at the movie theater in my life. This film never fades even after 20 years. I believe last night was much enjoyable than first time because I saw all three part at once in the theater with great audience.
I thought again that the screenplay is well written as a trilogy.
Through all three part, Biff crashed into dung, Marty says "Mom, I had a terrible nightmare", which made funs excited. Also there are some paradoxical scenes like Marty's shooting skill. In part 2, he is laughed at while he is respected in part 3.
The modern synonym of "Western", Clint Eastwood, is thought out of fashion in actual Western days. Calvin Klein, brand name, is used as the name of future son by his mother in her youth. These settings are really interesting. Personally, the chase scene of skateboard was the most exciting scene in part 1 & 2. The response of other audience in the theater was crazy for these two scene.