I figured out that you can go explore a place without the "required" level. Is that just the suggested level for the difficulty of the monsters, or is it a real mistake?
The third fake end, it doesn't show your character. That is, until you get him out of the left side. Then move to the right and there are hidden spikes. Hoo-ee.
The first fake end you have to find a hidden pitfall. The second fake end, you have to keep jumping. The more you jump, the higher you will jump, and eventually, you jump into spikes on the ceiling.