Right before Shawn saves a contestant from the BBQ exploding two "crew members" start to walk across the scene from the door on the patio then it goes back to Shawn and Gus talking, when it pans back to the patio the same two "crew members" walk across the patio. They used the same shot twice but cut it off the first time.
When Lassiter is talking to McNab about the accident, McNab is standing to his left holding a briefcase. Lassiter then turns away from McNab to take the briefcase from McNab who is now on his right.
(at around 18 mins) As Danny is being interviewed by Lassiter and O'Hara his shirt is wet under the arms with sweat yet seconds later when he runs into Shawn his shirt is dry under the arms.
When Gus pours the champagne, he fills Melinda's glass first. In the next shot, a close-up of the glasses, hers is empty. In the next her glass is full again and he fills his own.
The white underwear Shawn holds during the big reveal go from hanging loose to wadded up between shots.
Th skydiving aircraft shown, a Cessna 208 Caravan, has N9641FHI as it's registration number. US registered aircraft are allowed no more than five characters following the "N". You can have fewer, but you can't have more. Thus N9641FHI is fake and at least two characters too long.
The tire track skid marks showed the tread. That means the tires where hard braking in the direction of the skid. Not sideways and not fully locked with leaking brake fluid.
When Lassiter pulls the squad car in front of the plane, it's clearly a different person driving.
93011 is the ZIP (postal) code for Camarillo, not Santa Barbara.
While viewing the photos from Todd's accident, Shawn notices brake fluid on the ground and declares that the "accident" was no "accident." However, the brake fluid trail is located next to a complete dark set of skid marks, which means the tires were locked and skidding. Loss of brake fluid would not allow the brakes to lock and would have the opposite effect.