"Mysterious Mose" is certainly one of the stranger cartoons I've ever seen. It stars Bimbo as Mose and co-stars a very early incarnation of Betty Boop. However, this early Betty is quite a bit different from the typical later character, as she sports dog's ears (in the first half dozen of so of her films) and is very rubber-faced. In addition, viewers might be a bit shocked by what happens early in the film--when Betty is scared and her blouse flies off! You don't really see much, but it's very suggestive---and the sort of thing which would be eliminated once the new Production Code would be implemented in mid-1934. Following 1934, Betty's clothing became less skimpy and she became a bit more wholesome!
As far as the plot goes, there is not a lot here. Betty is in bed and is afraid. Then, she discovers that Mysterious Mose--a nice but freaky sort of ghost is running about--and results in a song and dance number where Bimbo disappears, stretches and cavorts about for the audience in a very odd and surreal manner. As I said, there isn't a lot of plot here! Not a bad cartoon--just not a particularly distinguished one, either.