On March 30, 2012 the Screen Actors Guild (SAG) and the American Federation of Television and Radio Artists (AFTRA) completed a merger of equals forming a new union SAG-AFTRA and as a result of this merger a group of actors including Schaal, her former stepmother Valerie Harper, fellow voice actor Michael Bell and actors Edward Asner, Martin Sheen and Ed Harris to name a few immediately filed a lawsuit against SAG President Ken Howard and several SAG Vice Presidents to have the merger overturned and the two unions separated because of their claims that the election held by both the SAG and AFTRA memberships was improper.
- Bound for Glory (1976)
- Record City (1978)
- It's a Living (1980) (TV series) (1980–1981) as Vicki Allen
- Fantasy Island (1978) (TV series) (1980–1982) as Julie
- AfterMASH (1983) (TV series)
- Where the Boys Are '84 (1984)
- Fatal Vision (1984) (TV)
- Knight Rider (1985) (TV) Episode: "The Nineteenth Hole"
- Creature (1985)
- Airwolf (1986) (TV series)
- Macgyver (1986) (TV series)
- Innerspace (1987)
- Munchies (1987)
- *batteries not included (1987)
- Night Court (1988) (TV series)
- The 'Burbs (1989)
- Northern Exposure (TV series) in 1992 as Tammy
- My Girl 2 (1994)
- Out There (1995)
- Friends (1997) (TV) Episode: "The One with All the Jealousy"
- Star Trek: Voyager (1997) (TV series) Episode:"Real Life"
- Small Soldiers (1998)
- Six Feet Under (2001) (TV series)
- American Dad! (2005–present) (TV series) (voice of Francine Smith)
- Night of the Hurricane (2011) (voice of Francine Smith)
- The Amazing World of Bloo (2012-present) (voice of Grace Clarkson)