Factual error: Sailing ships in harbor always have their sails furled and stowed, not set. All the ships in the city's harbor have their sails set. Would never happen.
Factual error: At the end of the movie, Lady has four puppies, three Spaniels, like her, and one mixed breed, like Tramp. Realistically, they would all be mixed breed with characteristics from both parents.
Factual error: Charlie Chan claims that mixing hydrochloric acid with ferrocyanide of potassium is mixing two acids. Ferrocyanide of potassium is not an acid. (00:27:00)
Factual error: Actual showboats were very rarely self-propelled. The engine and boilers needed to propel the vessel would have taken up the space needed for the stage, backstage area, and auditorium. As a result, they had to be towed everywhere by a towboat.
Factual error: When Jeremy and Jack climb the beanstalk and arrive on the clouds, it starts to rain. Where is the rain coming from?
Factual error: Abbott and Costello have inadvertently enlisted in the Army but anyone weighing 240 pounds or more will be rejected. When Costello steps on the scale, the Army physician tells him, "You're in the Army. You made it by two ounces." Medical scales at that time (1941) showed weight in whole pounds only and did not show ounces.