 Writer/director Raymond Abrashkin and actor Jay Williams later co-wrote the "Danny Dunn" series of juvenile science fiction novels.The film was filmed on location at Coney Island and Brooklyn, United States, using a unique, concealed strap-on camera, which made it possible for Engel to work without a tripod and large crew.It allowed him to have thousands of beach-going New Yorkers as extras without their knowing it.