Actors Tom Conti and Donald Pleasence both later appeared in Robert Altman's 'Basements' (TV) (1987) but appeared in separate segments they being ''The Dumb Waiter'' and ''The Room'' respectively.
The 'Blade on the Feather' title was derived from a line in the lyrics of the ''Eton Boating Song" which itself is also heard being sung in this tele-movie.
This tele-movie was first broadcast about eleven months after Anthony Blunt in 1979 was uncovered as the 'fourth man' of the Cambridge Five (a group of university educated students working for the Russians between the 1930s and the 1950s).
The name of the fictional fantasy novel for children that Professor Jason Cavendish (Donald Pleasence) had written was ''Cloud Cape''.
The place where where the English country house was situated was on the Isle of Wight where this tele-movie was shot on location.