In the early '80's Liz and her twin were in famous gum commercials as the 'Doublemint Twins'.
Liz and her twin sister were cast at separate times for their roles as cheerleaders in Grease II. When filming began, the director realized that real twins had accidentally been cast and re-wrote the parts to reflect the casting.
Liz has an identical twin sister who is 3 and 1/2 minutes younger and 1/2 an inch taller.
Liz Sagal played Sunny in Flashdance. She also played Ronette in Howard the Duck.