Carl gets rid of Bob by making him leave the machine everyone in their world is in.
Bob thinks Carl has put him in a Lotus-Eater Machine, but the audience knows that this is reality.
The machine was the fantasy, the paradise is reality.
Bob's paradise becomes a nightmare.
...Except that was layering Carl used to trick Bob.
...And then is paradise again as soon as he deals with the threat. People love him even more now!
Parodied: Carl suggests that it would be easier for Bob if he weren't a hero, and the mere suggestion causes him to fall into a dream.
Zig Zagged: Bob's in a machine of Carl's machinations, except that's the reality. But not really, that was a clever ruse. And now it's becoming nightmarish, but Bob saves the day and makes everything better...but that pushes it into Uncanny Valley perfection, making it no longer perfect...
Averted: Carl doesn't use this sort of manipulation.
Enforced: "We need Bob to be out of the way for the first half of the episode, but he would never let this happen..."
Lampshaded: "Ah, yes. Put me in a perfect world. I'll never figure it out."
"I won't make you stay. I'll just make you want to."
A huge amount of money is invested in creating a perfect virtual reality.
Exploited: Bob realizes early on he's in a fake world, but loves it so much he decides to just stay.