After being kidnapped and blindfolded, Rock Hudson is driven past a lake with a gaggle of geese nearby. He later thinks this was the sound of the guests at a cocktail party--until he retraces his route and discovers the actual source of the sounds. This idea was borrowed by the producers of Sneakers (1992) when Robert Redford is kidnapped, blindfolded and also thinks the sound of the geese he passed while blindfolded were people at a cocktail party.
Universal were said to be keen on bringing Alfred Hitchcock onto the project. At the time, however, he was far more interested in his ideas for what became Torn Curtain (1966).