“Frank Launder and Sidney Gilliat, the British writing-producing team that has clicked with such... mischievous comedies as Wee Geordie and The Belles of St. Trinians, have done it again with The Green Man, starring Alastair Sim, the long-faced pillar of those previous pastimes.... Don't be misled by the title; the Green Man is not Mr. Sim, this time appearing as an assassin who has a devilish clever way with home-made bombs. It is the name of a seaside guest-house - or, as they say in England, ‘an' hotel - where he plans to dispatch a pompous gentleman who is going there for a secret tryst with a girl. But it could be the tag of the assassin, for green is the figurative hue he turns on those sudden occasions when circumstances rise to balk his rash design.” (New York Times)
“A black comedy... that doesn't quite come off as a competitor to Kind Hearts and Coronets, but is wryly amusing in the traditional Launder-Gilliat manner. (It was based on a successful play that saw much re-working and sundry delays before finally getting to the screen.) Sim is admirably backed up by a group of rich character actors, with Raymund Huntley an especial standout as the would-be seducer who is thrown off his stride by a restaurant's daily special - chopped toad. Jill Adams, the charming leading lady, was one of Britain's own periodic answers to Marilyn Monroe.”