Dawson Casting: Silverstone and Murphy are almost young enough to pull off their roles, but they're the youngest. The oldest is 29-year-old Stacey Dash as Dionne; she would carry over into the spin-off series, until she was 33.
Technology Marches On: Modern viewers might miss the fact that Cher and her friends all having cell phones is meant to be a joke — a sign of how rich and spoiled these teenagers are. Nowadays, when every teen has at least one cell phone, the only thing that seems odd is how clunky the ones in the movie look.
The Other Darrin: About half the characters from the movie, most notably Cher herself, but also the rest of the Horowitz family. In fact, Mel Horowitz is subject to this again after the show's first season, meaning that three actors played him in the span of four years.