Jackie's 1977 yearbook is titled "Vikings", but in "The Pill" (s1e17), Jackie says she's a cheerleader for 'The Wolverines'.
During the adults' discussion of their children having sex, Kitty says, "Secrets cause cancer", and Midge turns to give Bob a pointed look. The next shot is a focus on Midge, who only then gives Bob that same pointed look.
Hyde is reading a "MAD" Magazine. He tells Jackie that he is reading "Smokey and the Band-Aid", which would be a spoof of "Smokey and the Bandit". However, Hyde is reading the June, 1976 issue, and "Smokey and the Bandit" was not released until 1977.