The Scottish castle scene was filmed at Vikingsholm, a private residence at Lake Tahoe. It was built as a summer home by Mrs. Lora Josephine Knight, in 1929.
The island showed at the beginning of the film is Fannette Island.
he Loch Ness Horror is a 1981 horror movie directed by Larry Buchanan, who had a reputation for helming poorly-made films and even proclaiming himself the "schlockmeister".The film is infamous for its poor special effects, meandering story, awful use of California doubling for Scotland and the fact that, as with almost all of his films, Larry Buchanan uses members of his family both in front of the camera and behind it, whether they are suited to the task or not.
The Nessie puppet (just a head on a stick) was later used as Jack the Ripper in one of the "Bullshit or Not?" segments in Amazon Women on the Moon.