So, this is something that's been perplexing me for a while. Season 3's production ended in early 2002, at which point the crew explicitly considered it to be the end of the show and went to work on the movie which was supposed to be the show's big conclusion, and Nick just spaced out the unaired Season 3 episodes as much as possible to hold people over. We know that at some point, Nick decided that they wouldn't let the show end even though Stephen Hillenburg wanted it to, which led to Paul Tibbit's takeover and Season 4. But the timing and circumstances of this have always been a bit of an interesting mystery to me. Season 4's first episodes aired in early 2005, so production for them must date at the very least as far back as early 2004, very likely going into 2003 or even 2002. But the crew didn't intend for Season 4 to exist at first, and made the movie to be the ending of the series. So at what point did Nick force them to continue? And how does this tie in with the movie- clearly Season 4 production and production of the movie must have overlapped, but wouldn't this have caused delays for either Season 4 or the movie? In addition, it seems like at first they only produced a few episodes of the season, since its airing stretched into 2007 unlike most other seasons which lasted roughly a year. I've also heard rumors that a few early S4 episodes like Krusty Towers and Patrick SmartPants were "originally intended for" Season 3, but I'm not quite sure how that works either. To be fair, I read that in the Trivia section of a Wikia article, so it's probably made up and it wasn't cited, but still interesting if there's a reputable source that backs that up.