- In 2012, with her Happy Days (1974) co-stars Anson Williams, Marion Ross, Don Most, and the widow of Tom Bosley, she sued CBS and Paramount for $10 million, claiming they never received merchandise royalties they were owed under their contracts. The case was settled out of court.
- Actress Susan Neher was the original Joanie Cunningham in Love and the Happy Days/Love and the Newscasters (1972), which was basically the pilot for Happy Days (1974). Moran eventually took the role of Joanie, at the request of Anson Williams, who had worked with her in Lisa, Bright and Dark (1973).
- Her acting mentor was Tom Bosley.
- Resided briefly in Tucker County, WV, in the late 1980s in the home of a relative of her first husband. She was sometimes confused for a local resident "lookalike".
- Winner, 2008 Fox Reality Channel Really Award for "Favorite Altered State" for her appearance in Celebrity Fit Club (2005).
- Was #71 on VH-1's 100 Greatest Kid Stars (2005).
- Best remembered by the public for her role as Joanie Cunningham on the sitcom Happy Days (1974). She was only 13 years old when she landed the role.
- Her house in Palmdale, CA, was foreclosed on in July 2010, and she had to be evicted.
- Erin was cremated; her ashes were given to her widower.
- She had English, Danish, German, Irish, and Scottish ancestry.
- She attended the "Hollywood Collectors & Celebrities Show", at Beverly Garland's Holiday Inn, in North Hollywood, California.
- Is the only one of the seven original main cast members of Happy Days (1974) to never have any children of her own.
- As of June 2012, she resided in New Salibury, IN.
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