spongebob episodes making me confuse

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there are actually lots of episodes in Spongebob that makes me confuse. 1. do spongebob have bones? at an episode, he said it himself-" sponges have no bones" but in another episode, he falls from a very high place and his bones are exposed, it got through his head and his sponge body was torn. 2. there is a beach (goo lagoon) under the sea? 3. no one can hurt a soft sponge? at an episode, he is being punched by his classmate at the boating school but the fist of his classmate only tickles him because he's so soft. but at another episode, sandy kicked his butt and he went flying. sandy's foot didn't just go through him and tickled him. 4. can they breathe air? at an episode, sandy challenged them to be outside the water and they are able to breathe but at sandy's first appearance, spongebob can't breathe in sandy's house. there are lot more episodes that makes me confuse aside from these. spongebob lacks consistency but i still love it. it is so funny. still one of the bests. any inconsistencies found?