- After a days shooting of Blood From the Mummy's Tomb he replaced Peter Cushing when Peter withdrew due to his wife being taken seriously ill and subsequently died.
- Although he played John Cairney's father in The Devil-Ship Pirates (1964), he was less than four years his senior in real life.
- Although he played Kerwin Mathews's father in The Pirates of Blood River (1962), Mathews was three months his senior in real life.
- Children: Andrew; Maureen; Sean Keir (actor and producer); Deirdre Keir (child actress and producer); Julie T. Wallace (actress).
- He was considered for the roles of Dr. Hans Fallada, Dr. Armstong, Dr. Bukovsky and Sir Percy Heseltine in Lifeforce (1985).
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