When Sayid is walking with his Commanding Officer, there are two tanks visible to the right of the building. They are supposed to be Iraqi tanks, but these are actually very rare World War II German Tank-Destroyers, specifically the Ferdinand/Elephant. These tanks were never used in any army after World War II.
When Jack is golfing for the second time (when the other survivors are watching him), his microphone cord is visible on his right side as his shirt lifts during his swing.
As Jack, Michael, and Charlie walk up to Hurley, the camera goes to the left of Hurley and you can see a road to the right of him and directly behind him a fence. If you look closely you can see a car parked under one of the trees. This can be seen in both the T.V. and DVD versions.
Locke says that Ethan exposed some tracks that might be "a rabbit or some other rodent", implying that rabbits are rodents. They aren't, they're lagomorphs.