A title card says, "One Year Later, 1962," indicating that Profumo addressed Parliament about Keeler that year. Profumo addressed Parliament in March 1963.
Near the end of the film, when Mandy Rice-Davies is surrounded by the press, one photographer, using a twin-lens reflex camera, has his finger on the lower (taking) lens at the moment of exposure. No professional photographer would make this mistake.
When Christine arrives at Heathrow from Spain after the scandal breaks, a modern illuminated sign is in the background as she walks from the gate.
When Mandy Rice-Davies and Christine Keeler walk alongside the river Thames in the early morning, a 1980s coach crosses the bridge in the background.