A good way to guage popular trends has long been to watch the covers of Archie comics. Here. Let's take a look at the 1977 dated issues (as well as the 2 1967 issues that would have come out in late '66). Above, we see slot car racing, for instance.
A perennial favorite--snow
Another old favorite--jalopy gags
And the go-to beach gag
the new beat
Swimming pools were all the rage
loud rock groupd
The British Invasion
And finally, pop art!