When Jules goes to check on McNab and cannot raise him on the mailbox speaker she goes to the gate. She checks the gate to find it is locked and starts to climb over it. Before she gets over it McNab comes to the fence and Jules opens the gate that apparently is not locked.
On the water bottle it says that Shawn has to keep his heart rate above 150, but when you get a view of the elliptical, the heartbeat is 119.
Shawn, Gus and Juliet took time trying to find the office phone so they could order pizza for delivery and when they couldn't find it they resigned to having Doritos for dinner instead when there's no reason they couldn't have simply used one of their cell phones to order the pizza.