Donna tells Hyde she's only dated Eric. She also dated Kelso's brother, Casey.
Karen, the musician with "really big boobs", is small-breasted.
When Jackie and Kitty are trying to meet Christine St George, the receptionist says she should have been Brooke Shields. The episode is set in 1979, when Brooke Shields was 14.
The gang is always referring to the mountain air. Wisconsin doesn't have any mountains, although there are some high bluffs, etc. The highest elevation is 600 meters.