 In an odd connection between O'Brien and his most famous creation, stock screams that were used in "King Kong" can be heard in the scenes where the creature attacks the ferry and when it invades London.In the book "Video Movie Guide 2002", mention of the stop-action animation was made, but with the proviso that "the film monster wasn't bad but Willis O'Brien was clearly working with a low budget".The original 71m 07s version, as "The Giant Behemoth", was initially given a X certificate by the British Board of Film Censors on 9 January 1959, before a version cut to 69m 07s, as "Behemoth the Sea Monster", was given an A certificate four days later.