These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
If you have the money for it and sleep at an inn, they will charge you the normal price. If you don't, you sleep free.
The Egg Dragon has its HP set at the Cap, but the programmers didn't set a maximum HP value. As a result, using any sort of healing on it will overflow its HP, leaving it weak enough to finish with a single hit.