The brochure on the VonRoenn windmill spells "historical" as "hisorical".
In several shots before Lem escapes from the Pie Hole, you can see that his right hand is real, not the wooden one Ned pulls off his arm later. This is intended to be a joke. Elsita's normal-looking leg is similarly revealed to be a crude wooden prosthesis near the end of the episode.
When Braden Caden's Aviation Insurance policy is shown, it is in fact a contract for a Nokia cell phone. The text is clearly legible in the high-definition version.