The bright neon colored leotards and tights seen throughout the exercise segments historically did not appear in 80s fashion until around 1984. In 1981, when the series is set, women in exercise classes typically wore solid colored leotards and tights more reminiscent of the style from the 1970s.
In the opening scene of the series, Rose's husband Danny suggests that one of their party guests has lingered behind to "hook-up" with them. The scene takes place in 1981, decades before the term "hook-up" was used to refer to casual sex. (Wolfe, Tom. "Hooking Up". New York Times. 29 July, 2013.)
About 10 minutes in, there is a mask in the dish rack right next to Rose.
She was asked to hide it in the sink for the next take, but somehow this the one they aired.