Introducing the Batplane and the Batarang!
This issue was co-written by Gardner Fox and Bill Finger, and shows both their influence. Gardner Fox, always known for his science fiction emphasis, gives us two more bat gadgets - the Batplane (actually Batgyro - which is even cooler because it can hover), and the Batarang, "modeled after the Australian Bushman's boomerang". While this was the beginning of the bat gadget trend that would get out of control by the 1960s, way back in the 30s, it was just plain cool. Bill Finger and Bob Kane, for their part, keep this Batman story true to the original conception, with lots of full moon night skies and mystery elements.
Also for the first time we learn that Bruce Wayne has a fiance, Julie Madison. While the story does have some down sides - Batman already starts performing some pretty incredible stunts, and the villains seem to have unlimited access to any kind of dangerous creature they need from gorillas to poisonous snakes - on the whole it's still pretty good.