Il giorno più lungo di Scotland Yard

The movie had a difficult time getting shown in England. When the movie was first submitted to the British movie review board, it was rejected because it appeared that Queen Elizabeth II was acting in the movie. Producer Samuel Z. Arkoff managed to get the board's approval by adding a disclaimer at the beginning of the movie stating that the Royal Family had not participated in the making of the movie and that Queen Elizabeth's appearance was done using newsreel footage. Then English distributor EMI, which was the distributor of Arkoff's movies in England, stated to the press that that they were "a defender of the palace" and refused to handle the movie. The J. Arthur Rank Organisation, the other major movie distributor in England, also joined the boycott for the same reason. Ultimately, the movie only played in a few theaters in England.

At the end of the initial shooting scene, in Belfast, a train goes past in the background. It is clearly a dark blue British Rail DMU with the white double arrow symbol of BR. But Northern Ireland Railways (NIR) was not part of British Rail in 1975. NIR DMUs at the time would have been two-tone red and white or blue and white.

This motion picture incorporates extracts from a news film of The Queen at a State Opening of Parliament which, when photographed, was not intended for use in a fictional context. The Directors of Hennessy Film Productions, Ltd. would therefore like to make it clear that the Royal Family took no part in the making of this film.

Referenced in The Starlets (1977)