- Won his most famous role as the Beaver by admitting he'd rather be at his Cub Scout meeting than auditioning for the show. The producers chose him because they wanted a boy with a "real boy" attitude.
- In the late '90s he owned and operated a sideline catering company in Santa Clarita, CA. It was called "Cleaver's Catering", with him using his "Beaver" photo, but was sued by the studio that produced the show. The court, however, ruled the studio did not own the image of Jerry's face. Concerning the company name, he proved he also butchered meat for his company using cleavers.
- Served in the US Air Force National Guard during the Vietnam War. He was mistakenly reported as having been killed in action when a soldier with a similar name appeared on a "KIA" list.
- Spokesman for National Psoriasis Foundation.
- His acting mentor was the late Barbara Billingsley.
- Earned his BA in Philosophy. Worked in banking and real estate in the '70s.
- Played in a rock band called Beaver and the Trappers.
- He has played the same character (Theodore "Beaver" Cleaver) on three different series: Leave It to Beaver (1957), The Love Boat (1977) and The New Leave It to Beaver (1983).
- In 1974 he got a B.A. from UC Berkeley (CA).
- Father of Noah Mathers, Mercedes Mathers and Gretchen Mathers.
- Revealed that he had a wonderful working relationship with Barbara Billingsley on Leave It to Beaver (1957).
- Older brother of James Mathers and former child actress Susie Mathers.
- Profiled in the 2016 book "X Child Stars: Where Are They Now?" by Kathy Garver and Fred Ascher.
- With the passing of Tony Dow (Wally Cleaver) on July 27th 2022, he along with Jeri Weil are the only living cast member from Leave It to Beaver (1957). There are other living cast members as well.
- Best known by the public for his starring role as the title character on Leave It to Beaver (1957).
- In 1960 MGM toyed with the idea of doing an all-male remake of The Women (1939) that would have been entitled "Gentlemen's Club". Like the female version, this would have involved an all-male cast and the plot would have involved a man (Jeffrey Hunter) who discovers that his wife is having an affair with another man (Earl Holliman) and after going to Reno to file for divorce and begin a new life, he finds out that his wife's lover is only interested in money and position; he decides to win his true love back again. Although nothing ever came of this, it would have consisted of the follownm0001822ing ensemble: Hunter (Martin Heal), Holliman (Christopher Allen), Tab Hunter (Simon Fowler), Lew Ayres (Count Vancott), Robert Wagner (Mitchell Aarons), James Garner (Peter Day), Mathers (Little Martin), James Stewart (Mr. Heal), Ronald Reagan (Larry), Troy Donahue (Norman Blake), and Stuart Whitman (Oliver, the bartender who spills the beans about the illicit affair).
- No relation to Marshall Mathers who is better known as Eminem.
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