Wissenswertes

The lines quoted by Inspector Cockrill and Mr Eden come from William Shakespeare's 'The Merchant of Venice', Act 5 Scene 1.

The BBC used the plot of this for Father Brown (2013) series 4, episode 6, The Rod of Asclepius (2016).

In the UK, surgeons, even though they have graduated medical school like all other physicians, are traditionally called Mister (or Mrs. or Miss).

Although a popular literary detective who appeared in six mystery novels, Christianna Brand's hero only appeared in this movie.

Alastair Sim would play another eccentric police officer in Ein Inspector kommt (1954) eight years later.