When they first arrive at the fair, Lisbon squeezes the car remote to lock the car before Jane has shut the passenger door. The car chirps on cue, but the hazard lamps never flash.
At the End when Patrick enters the house and is confronting the killer, he has on an FBI badge. He then runs up stairs and enters the bedroom, at which point the badge is gone. When the camera cuts to a different angle, it then reappears for the rest of the scene.
The Sacramento County Fair happens annually in June. From the season premiere, we know that it's already fall.
A county fair in Sacramento , California would be a larger affair than what is shown on the program. It also would not have animals, as changes in the laws make it too expensive to use them in small fare and carnivals.
When Danny and Patrick are in the remote cabin alone, Danny is drinking a beer from the bottle.
While the actor tries to make it appear differently, the bottle he's holding is clearly empty.
The Sacramento County Fair is put on annually at Cal Expo, which is in one of Sacramento's business districts, not in the middle of the countryside as shown.