Although the leap date is October 16, 1968, the next day's newspaper is dated November 16, 1968.
When the women are protesting in the club, the progression of the blood on Susan's lip changes position on her face.
The teaser has Sam leaping in during a "bra burning" rally. There is no contemporary evidence that any such event ever actually took place, anywhere. "Women's libbers" did at times symbolically throw bras in the trash, an image commonly conflated with men burning their draft cards. The powerful image (bra burning) that this conflation created has kept it in the public consciousness.
October 17, 1968 is referred to as being a Friday. In actuality, it was a Thursday.
A closeup of Al's handlink reveals an alkaline battery beneath its transparent pieces. On the DVD, this is about 10 minutes 47 seconds into the episode.
(at around 40 mins) While Sam is driving the blue station wagon, two later model cars (80s Mercedes Benz and an Audi / Volkswagen Fox) are viable. The Audi / VW has a CA license plate that was issued from 1982 - 1987.
One of the books in the Sanders' living room is "The Female Eunuch" by Germaine Greer. This book was not published until 1970, two years after this episode takes place.