The 80's was a great Decade for films so many films now deemed as "classics", Disney upped their game and delved into Science Fiction with success with the film "The Black Hole" in 1979 and "Tron" in 1982. A number of films gained the classification of "The Chick Flick", Pretty in Pink was a perfect example and a personal fav of mine. There was a few trilogies made, one of which became the most talked about, "Back to the Future" was a Trilogy which was a perfect family film. Even now all these decades later it's still talked about and probably one of the most memorable film of the decade.
Music wise, got off to a great start, new music, new technology but IMO the music scene declined around 1987 with the arrival of SAW who produced a lot of mindless drivel, however they did give us Kylie.
One thing that really changed was the amount of number one singles, during the decade the amount of number one's increased, not many singles stayed at number one for 4 or 5 weeks which used to be the norm.
The Christmas number one has always been the "Holy Grail" if your single made number one for Xmas it was number one for the following week.
This was because back in those days the Pop Charts took a break for xmas, I don't know when that changed.