This is a list of all the times Spongebob/Characters on Spongebob change Colors
Help Wanted: When Spongebob is talking to Patrick near the Krusty Krab, he says Im ready 3 times. When he jumps up on his last time and it shows a close up of him, his tie folds are red.
Doing Time: When Mrs.Puff explains that there is uranium in the water supply and it is crystal clear, when she drinks it her hat turns black
Rock-A-By-Bivalve: When Patrick comes home the second time from work, Spongebobs tie is black.
4th season Dvd Box set Disc one: On the case, On Spongebob and Patricks Fezzes, the eye is Blue, when during the episode Good Neighbors, the eye is red.
4th season Dvd Box set Disc two: Spongebob and Squidwards Krusty Tower Uniforms are red, When in the Episode Krusty Towers, They are blue.
These are alot of color changes in Spongebob. Just wanted to post them.