Barry's only Broadway role was The Private Ear and the Public Eye, in 1963.
Although Alfred Hitchcock said that he offered him the role of Robert Rusk in Frenzy (1972) after seeing him perform in a play, Foster later learned from Hitchcock's secretary that the director's decision was actually based on having seen him in Twisted Nerve (1968), a thriller with a distinctly Hitchcockian flavour.
Both of Foster's daughters - Miranda and Joanna - are both actresses, but his son Jason has not gone into acting.
After Barry Foster's death, a trust was set up, The Barry Foster Memorial Appeal to help disabled children become involved in the theatre.
Some obituaries (i.e. BBC Online) incorrectly stated Barry Foster's year of birth as 1931 - the British Film Institute website provides definitive year of birth as 1927, based on a check of the birth and marriage certificates held at the Family Records Centre, London.