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Plot holes
Doug says his dream since he was young was to be an IPS driver (or a sandwich maker). However, during a flashback in another episode, he lies to Carrie saying he had a job in order to sleep with her. She offers to drive him to work and he asks her to drop him off at what turns out to be the IPS building. He enters and spends weeks just hanging out there, killing time, and one day he's offered a job.
Uncle Stu says he is looking forward to riding in Doug's IPS truck. Having an unauthorized rider is grounds for dismissal.
In previous episodes, the IPS trucks have something (netting) to keep the load in back from sliding forward when the truck brakes. For some reason that was left for this story-line.
When Doug is riding with Stu, you can see that Doug's truck lacks the proper motor vehicle stickers on the windshield.
Doug says his dream since he was young was to be an IPS driver (or a sandwich maker). However, during a flashback in another episode, he lies to Carrie saying he had a job in order to sleep with her. She offers to drive him to work and he asks her to drop him off at what turns out to be the IPS building. He enters and spends weeks just hanging out there, killing time, and one day he's offered a job.