[1] The story by Nel King and Paul Jarrico (who wrote under the pseudonym "Peter Achilles") is an updated version of William Shakespeare's Othello, set in the London jazz scene of the 1960s.

He has arranged for Rod to fund the venture, and also has interested Lou Berger, a powerful booking agent, but the support of both men is dependent on the truth of Johnny's claim that Delia will be his vocalist.

As Emily, and then Rod, exit, leaving Johnny alone in the nearly-dark warehouse playing a frantic solo on the drums, outside, Rex and Delia walk along the embankment, their arms around each other's shoulders.

Gene Kelly, her husband at the time, intervened to get her the part in Marty (1955) for which she earned an Academy Award nomination, but she eventually had to move to Europe to pursue her career.

Anyone looking for straight drama will find the narrative with its doped cigarettes, tape-recorder stratagems, copious intrigues, corny jazz jargon spoken in mid-Atlantic accents, and more or less happy ending, both unconvincing and wearying.

[5] Jeff Stafford of TCM.com, on the other hand, wrote that "the film was unfairly maligned by many British critics who were Shakespeare purists and dismissed [it] as a travesty of the original with a 'happy' ending – sacrilege!

"[6] In his November 11, 1962, "British Film Scene" column in The New York Times, Stephen Watts included a piece about Patrick McGoohan, titled "On the Ascendant", in which he noted that the actor "has been well received here for his appearance as the somewhat neurotic jazz drummer in All Night Long.

"[7] The film was released on DVD in the UK by Network in 2007, and in the US by The Criterion Collection in January 2011 as part of their "Eclipse Series" box set "Basil Dearden’s London Underground".