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01
At age 10, he learned conjuring tricks from neighbor Harry Houdini.
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02
Director Don Siegel recalled that during production of China Venture 1953, O’Brien’s eyesight and memory were failing, so he had his assistant read him lines just before scenes.
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03
He was originally cast as Lt. Kenneth Fuller in Black Christmas 1974 but poor health forced him to drop out; John Saxon replaced him.
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04
At Sam Peckinpah’s surprise birthday party, O’Brien recited Shakespeare with Keith Moon.
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05
He served in the US Army Air Force during World War II.
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06
O’Brien was originally cast as Jackson Bentley in Lawrence of Arabia 1962 but suffered a heart attack and was replaced by Arthur Kennedy.
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07
In his film debut The Hunchback of Notre Dame 1939, O’Brien had a slender leading-man look, but later gained weight and was typecast as a character actor.
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08
O’Brien appeared in two films depicting the Normandy landings: D-Day the Sixth of June 1956 and The Longest Day 1962, both also featuring D-Day veteran Richard Todd.
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09
His childhood nickname Tiger inspired the name of his production company, Tiger Productions.
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10
He frequently portrayed characters with drinking problems and possibly struggled with alcoholism himself.
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11
He appeared in three Oscar Best Picture nominees: The Greatest Show on Earth 1952, Julius Caesar 1953, and The Longest Day 1962; only the first won.
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12
Six of O’Brien’s films are in the National Film Registry: The Killers 1946, White Heat 1949, D.O.A. 1949, The Hitch-Hiker 1953, The Man Who Shot Liberty Valance 1962, and The Wild Bunch 1969.
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13
As of 2023, he is the only actor to win an Oscar for playing a character named Oscar in The Barefoot Contessa.
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14
He is interred at Holy Cross Cemetery in Culver City, California, in plot F, T54, 50.
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15
With Olga San Juan, he had three children: actress Maria O’Brien, TV producer Bridget O’Brien Adelman, and Brendan O’Brien.
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16
He was the younger brother of Liam O’Brien.
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17
He was the ex-father-in-law of actor Michael Anderson Jr.
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18
Through his son Brendan, he was father-in-law of Ingrid K. Behrens.