It was a bottle episode created due to the budget being too low for the amount of episodes they were given, the writers had no plans for it and without it the entire show would be the exact same. Any special meaning or symbolism you're seeing in it doesn't actually exist.
Bottle episode this, budget too low that. la la la LA LA
Maybe they the rejected large amounts of money for the sake of art? Yeah, didn't think about that one now did you!