I was wondering how one gets back there w/o being noticed, but I was thinking of the fences by the front of the ride where it seems like the fence isn't easily climbable and would be noticeable to many people. Since it happened back in the pretzel loop/vertical loop (?) portion near the end where the ride comes pretty close to the ground 3 times he must have worked his way over a fence somewhere over by SOB/The Bat ques. There are several spots there that would be easy to get over the fence/hedges. What precautions lie beyond those clearly identifiable ques and the service road I don't know. Once you are on the access road, getting to the fence around the low areas appears to be easy, and based upon the POV, the fences appear to be little more than the standard chain link fence, maybe 6-8 tall, but easily climbable (though I'm sure well marked) if someone was determined.
Hopefully this guy can make a full recovery; unfortunately his asshatery is likely going to cost the park money and require even more idiot proofing of all parks down the road. If it was a set of keys that were dropped, that seems like a potentially challenging item to find depending on how recently that grass has been mowed.
cargo pants with zippers is the answer folks, its not that difficult, but I'm guessing we are going to start seeing metal detectors and short term "ride" lockers like universal has (not to mention steel vengence and other rides). The ones at Universal are quite easy to manage/use.