Over the years, the Fleischer Brothers Studio changed Betty Boop on many occasions. At first, she was a dog-girl---with a voluptuous human body and puppy ears. This didn't last long and soon the weird ears were abandoned. Then, with the advent of the new Production Code in 1934, Betty was de-sexed a bit--with fewer curves and more clothes. Now, here in "Musical Mountaineers" she's changed again--though I am really not sure why. Instead of the usual look, Betty is much taller and thinner--as if she was suddenly being drawn by someone who only had the vaguest recollection of how she should look. Regardless, today we don't think of this as Betty Boop since the series was soon discontinued after this short.
"Musical Mountaineers" finds better heading into feuding country (probably Kentucky) when her car breaks down. At first the folks are hostile--they think she might be a Hatfield. But, they soon make friends and help Betty to be on her way.
Now a whole lot in the way of plot or humor. This is a pleasant and well-animated cartoon but nothing more.