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On the page for the South Park movie, South Park: Bigger, Longer & Uncut (as well as the Western Animation folder on the Early-Bird Cameo page) it lists under the Early-Bird Cameo trope that Butters made several cameo appearances throughout the movie, but his properly named and voiced introduction wasn't until Season 3 (the season made during and after the movie's production). However, Butters' debut wasn't the movie; he has made appearances ever since the series' pilot episode ("Cartman Gets an Anal Probe"), though he was mostly a background character at that point. Isn't the Early-Bird Cameo trope only for the episode that a major character debuts in but only appears as a background character?
Something that should be noted, though, is that literally three weeks after the movie was released, the first episode in the series where Butters is introduced and plays a major role ("Two Guys Naked in a Hot Tub") aired, so does that make the character a more accurate example of the trope or not?