Other mistake: When the Disco Volante separates to escape the cruisers firing on it, the "cocoon" is seen facing the pursuing ships stern first. When the shot changes to show the gunners firing on the ships the back half of the "cocoon" has turned completely around; the gunners are firing from the separated mid section of the Volante and the stern of the "cocoon" is now facing away from the cruisers, making it easy to see which parts of the scene were filmed live and which were done in the studio.demodon
Other mistake: The Japanese plane and the German plane are actually the same aircraft type, a British Design called an "Eardly Billing." The "Japanese" version is re-dressed with canvas partitions between the wings, painted dragons, etc, the "German" has no canvas and German eagles, but they are the same machine.
Other mistake: When Ryan arrives at the camp he observes a funeral taking place yet when he goes to meet the camp Commandant he asks what they are celebrating outside.