- His production company, "Amy International", is named after the character that his wife, Susan George, played in Straw Dogs (1971).
- He was offered the role of Captain Jonathan Archer in Star Trek: Enterprise (2001) before Scott Bakula was cast. However, he turned it down, opting to play Harry Harper in Casualty (1986) instead.
- In between marriages, he was romantically involved with actress Linda Purl. They worked together on TV and stage, where he directed her in the play "A Doll's House" in Los Angeles.
- Son of a Royal Air Force Group Captain, Peter Bernard MacCorkindale, OBE. MacCorkindale was educated at Haileybury and Imperial Service College before abandoning plans to follow his father into the air force due to declining eyesight. An early interest in theatre saw him first direct then act after attending Studio 68 at the Theatre Arts School in London.
- He died two days before the death of his Falcon Crest (1981) co-star Chao Li Chi.
- He married Susan George in Fiji in October 1984.
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