I found a link to this website on pinterest and thought it was just okay until I got to the Spongebob section. Dang, I'm still a little disappointed in myself for not realizing any of this while watching the show during the last probably 10 years of my life! After my initial shock I decided to look up some more on the topic and I was lead here where they mention some of this:
All of these live in Bikini Bottom-
the Krusty Krab
Each character matches with one of the seven deadly sins.
Spongebob-Lust (now this one may be hard to figure out but think of Lust as too much love and Spongebob does love everything)
What about when mermaid man and barnacle boy where looking for the invisable boatmobile and mermaid man jumps in you see him land on something and he says i knew we should have got the automatic no one ever notices that one
Spongebob lives in a pineapple. One definition of pineapple on Urban Dictionary is vagina.
Spongebob calling Mrs. Puff a c*nt....
There are more videos on youtube that show some subliminal messages, but I don't think they're that great. I guess I'll be paying better attention the next time I turn on a cartoon.. :/