Does anyone notice changes in the quality/content of children's cartoons?

My daughter is three and Spongebob Squarepants is a frequent cartoon that plays on our television. What I’ve just noticed is that the placement of the grill at the Krusty Krab always changes from next to the serving window to the back of the room. Not only this, but also the colors of the characters have changed from when the cartoon was first launched on Nickelodeon. I’m not sure if this is just a Nickelodeon thing or if other stations do this with their cartoons (like Cartoon Network or the Disney Channel).