Patzer

The beauty spot on Marilyn's face is missing in one scene and moves from the left to the right side of her face in at least one scene.

In addition to the continuity error about the anamorphic lens seen in the preview theatre two different versions of the rushes are shown in that scene. When Olivier and Vivien Leigh are watching they are looking at a very wide cinemascopic version but, when it cuts to a different angle as they stand up to leave, the image is more of a 16:9 ratio.

In a scene of dialogue between Laurence Olivier and Colin Clark in Olivier's dressing room, shots of Olivier's face alternate several times between his having a noticeably heavy amount of black makeup on one eyebrow and having no makeup on either eyebrow.

Lucy runs her fingers through her hair when talking to Colin and afterwards the curl is over her left shoulder. When she tells Colin that his heart needed breaking, there is a curl over each shoulder.

A frustrated Olivier tells Colin that he should have cast Vivien to play Elsie instead of Marilyn. Marilyn bought the rights to "The Sleeping Prince" from its author Terence Rattigan, and hired Olivier, who agreed to co-produce the film, to direct; she could not be replaced.

The Union man tells Colin that Marilyn will need a bodyguard. Scotland Yard assigned a bodyguard to Marilyn and Arthur Miller during the duration of their stay in England, over their objections.

Greene tells Colin that he and Marilyn had an affair. This claim was made years after Marilyn and Greene had died, and has no basis in fact.

In the opening sequence, Marilyn appears singing "Heat Wave" on the screen of a movie theater. She sang that Irving Berlin song in Rhythmus im Blut (1954) with a totally different set and costumes.

Greene tells Colin that he's known Marilyn for seven years. Greene and Marilyn met for the first time in 1953 when he shot her on assignment for Look Magazine, three years before the movie takes place.

On Colin and Lucy's first date, when they're dancing at the nightclub, one shot is mirrored, as can be seen by the musicians' positions on the stage and the bassist's temporary left-handedness.

In the screening room sequences, a close up of the projector lens reveals an anamorphic lens, which would be projecting the image in Cinemascope. "The Prince & The Showgirl" is not a wide-screen movie and rather shot in full academy, 1.37:1 aspect ratio. Furthermore, when the dailies are shown on screen, the image looks closer to 1.85:1, much wider than the original format of the movie.

On the label of one of the medicine bottles next to Marilyn's bed, the branded barbiturate Tuinal is misspelled as "Tunial".

In the sign on the Dog & Duck, the word "accommodation" is incorrectly spelled.

Around the 1 hour 17 min. mark, two close-ups reveal medication bottles next to Marylin's bed. The name of one of them is misspelled "Tunial." The correct spelling is Tuinal, a combination of barbiturates.

In the closing credits, the word "Love" in the title of the song "When Love Goes Wrong (Nothing Goes Right)" is misspelled as "Loves".