The Diplodocus skeleton prop from this film was used in the scene where C-3PO sees the Jawa transporter in the film Star Wars: Episode IV - A New Hope (1977), which was made at Elstree Studios.
The source novel of the film, "The Great Dinosaur Robbery" by Robert Forrest Webb and David Eliades under the pseudonym David Forrest, was written with an adult audience in mind. It was also set in New York City. Both authors researched the location and time period thoroughly with a lot of help from the American Museum of Natural History. They were highly disappointed with Disney's decision to make a "children's" film from the material.
Helen Hayes, Joan Hickson, and Sir Peter Ustinov would all go on to portray Agatha Christie's detectives Miss Jane Marple and Hercule Poirot, respectively.
The title is a parody of One of Our Aircraft Is Missing (1942), in which Peter Ustinov (Hnup Wan) and Hugh Burden (Haines) also appeared.