- Plummer is a member of the Shasta County Sports Hall of Fame.
- Plummer's family is full of professional baseball players. His father, William Lawrence Plummer, and uncle, Earl "Red" Baldwin, played in the Pacific Coast League in the 1920s and 1930s. Plummer's grandson, Conner Menez, is a pitcher for the San Francisco Giants.
- Earned his Bachelor of Arts degree from Chico State University while managing the Chico Heat in the late 1990s, decades after leaving Shasta College after one year and signing with the St Louis Cardinals in 1965.
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