: This was the first season without Mary Kay Bergman (who died in 1999). She was replaced by Eliza Schneider and Mona Marshall , who took over the major female roles.
: Reviewers often note that Season 4 is where Stone and Parker finalized their comedic formula, allowing the show to become more "solid" and less reliant on pure slapstick. South Park - Season 4
: On IMDb, the season holds a strong user rating, with many fans considering it the start of the show's "Golden Era". : This was the first season without Mary
: In the episode "Fourth Grade," the main cast—Stan, Kyle, Cartman, and Kenny—finally moves from third to fourth grade, a status they have maintained ever since. Character Introductions & Shifts : " the main cast—Stan