- Had five children by Judith Crabbe while married to Helen Cavaco, who went public with Olson's double life in 1956.
- Mother, Annie Doris Games, was Portuguese; father, Carl Hjalmar Ferdinand Olson, was from Sweden.
- Dyed his hair, got tattoos on his arms, and bought fake identification to appear 18 so that he could fight professionally.
- World middleweight boxing champion, he won the belt from, then lost it to, Sugar Ray Robinson, whom he fought 4 times. Inducted into the International Boxing Hall of Fame in 2000.
- Bo Belinsky was nicknamed after him. Olson was nicknamed "Bobo" by his sister.
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