Hey, It's That Guy!: An odd version that happens within the same series the That Guy came from. Rick Rockwell, who played The Other Darrin of Jim Richardson in the second film, plays Lance Boyle, the protagonist of the third film.
Old Shame: George Clooney's star has risen a little bit since he got third billing in Return of the Killer Tomatoes. Oddly, this trope is apparently averted in the case of Stephen "Rock" Peace. After making the first film, he got a serious job as a state senator in California. Despite this, he participated in the writing and production of the second film and animated series, even reprising his role (though not as a main character). Maybe it's true, you have to have no shame to get into politics.
The Other Darrin: Richardson, Sam Smith, and Greg Colburn are all played by different actors in the second film.