- He worked with Maria Schell in As Long as You're Near Me (1953) and her younger brother Maximilian Schell in A Bridge Too Far (1977).
- Father of Christiane Krüger and Hardy Krüger Jr..
- In later years he often gave lectures for the Amadeu Antonio Foundation, which campaigns against far right politics, racism and anti-Semitism. Krüger drew on his experiences as a member of the SS during the final months of World War II.
- He allegedly refused to take part in an ambush of US soldiers in March 1945 and was sentenced to death for cowardice. A higher ranking SS officer revoked the death sentence and put him to work as a front line messenger. It was claimed that Hollywood made the story up after Krüger became an international star, since he could not conceal his special education at an elite Adolf Hitler School at the Ordensburg Sonthofenand and his assignment to the SS.
- Cousin of actress Lea Lander.
- He retired from acting in the late 1980s.
- Was among the actors being considered for Dr. Hans Fallada and Dr. Bukovsky in Lifeforce (1985). Frank Finlay and Michael Gothard won the respective roles.
- While shooting Hatari! (1962), he fell in love with Africa. He bought the Momella farm, where much of the movie was shot. He then opened it up as a tourist lodge. This is located at the northeast border of the Arusha National Forest in Tanzania, some 23 miles from Mount Kilimanjaro.
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