Hulk vs. Toad Men
I can accept that an alien race evolved on another planet to look a lot like toad men - but the fact that they actually call themselves the Toad Men? Granted, 'the Skrulls' was already taken, but maybe they could have come up with something else to call themselves.
Then there's the fact that all their technology is based on magnetism - cool concept, until they do all sorts of things with magnetism that they shouldn't be able to do. Really, Stan Lee needs to get over using 'radiation' and 'magnetism' as his catch-alls.
But, let's face it, there's a certain standard Silver Age goofiness you have to accept when reading comics from this period - and if you can, The Incredible Hulk provides about as rewarding an experience as you can get from the time. Reading this comic is like watching a great black-and-white drive-in movie, you know, one of those Ray Harryhausen flicks, or maybe a Toho Sci-fi Monster movie - which isn't surprising, because these comics pretty clearly were influenced by the former, and influenced the latter.