You can always tell when people are 'dressing late 80s/early 90s'
...instead of being more authentic. If you watch the real show or any other TV show from 1987-1995 time like Full House or Family Matters, then you can see how people really dressed from the late 80s through even the mid 90s. Which was basically the Saved by the Bell era, especially if you include the college years and even the New Class.
But from the clips I've seen it just seems a too exaggerated, even by the stupid cheesey Saved by the Bell standards. The cast looks like they are going to an over exaggerated 80s themed party instead of how it really was in 1989 or 1994.