House of Errors (1942)

Bert and Alf are fired from their jobs as delivery "boys" for a newspaper. They decide to be reporters on their own and set out to get a story on the inventor of a new machine gun. The inventor hates reporters so the boys pose as a valet and a butler and are hired. A reporter from their old newspaper shows up and gains admission by claiming to represent an American Legion paper, while a friend of the family and a phony representative of an arms manufacturer also show up with intentions of stealing the gun. Bert and Alf, suspicious of the pair, steal the gun themselves to protect it. They arrive back, after a night of misadventures at a flophouse, just as the crooks are making off with a dummy gun and the inventor's daughter.