The realistic newspaper footage, was shot in the Fleet Street offices of Express Newspapers, and gives a vivid picture of the "old" London Fleet Street industry (most British newspapers have now moved out of this area, which was famous as a press center). "Express" Editor Arthur Christiansen plays himself in the film.
In an early scene Jeannie is struggling with a Roneo stencil duplicator, saying it is "over-inking". The Roneo company threatened to sue the producers for the potential damage to the reputation of their products.
The scenes of the "Met Office" were filmed both outside and inside the Ministry of Defence main building in Whitehall. This access was remarkable. Those interiors were little changed, until refurbishment after 2000.
At the beginning of the film, Peter Blythe makes a brief uncredited appearance as the copy desk boy taking Stenning's story, and Leo McKern stars as science reporter Bill Maguire. They would both star together in the hit television series Rumpole of the Bailey (1978), with McKern in the title role and Blythe as head of chambers, Sam Ballard.
At around 1:30, near the end of the movie, Bill Maguire quotes the first two lines of the 1826 poem "Casabianca" by British poet Felicia Dorothea Hemans: "The boy stood on the burning deck/Whence all but he had fled".