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Despite playing a high-schooler throughout the 4th season, Cynthia LaMontagne (Big Rhonda) was actually in her mid-thirties.
In the alternate universe where Eric and Donna never dated, Kelso comes to Donna and Hyde's wedding as "Cedar Rapids' number one anchorman." Ashton Kutcher grew up in Cedar Rapids, IA.
When the angel (Wayne Knight) takes Eric to his ten-year high school reunion, Jackie confronts Kelso. Jackie was a class behind the rest, and would not be attending the reunion on her own.
In the alternate timeline, Hyde ends up in prison. Sadly, this would prove prophetic. In September of 2023, Danny Masterson, who played Hyde, was sentenced to 30 years to life for raping two women.