During the opening credits, there is footage of a panting dog. However, when American censors saw the footage, they assumed that the dog had been harmed. This run-in with American censors caused Kurosawa to remark that this was the only time he wished Japan had not lost WWII.
The gun, which is the object of a search in the film, is a .25 caliber Colt model 1908 hammerless Vest Pocket Automatic.