Other mistake: When the two goofy base jumpers are seen camping out in their tent, they have a large lantern and a big cooler underneath the lantern. These items are quite bulky and fairly heavy, hardly the kind of stuff that extreme base jumpers would carry around in their packs. In fact, that stuff would be really hard to fit into their packs at all.
Continuity mistake: When Hal is on top of the mountain with the English bad guy and the guy with the tracker, the guy with the tracker tells the English bad guy to get rid of him quietly. 30 seconds later the same bad guy looks up and sees the English guy falling down the cliff having being killed by Hal. The bad guy has climbed down about 5000 feet in 30 seconds.
Factual error: The rabbit is making squirrel sounds.
Continuity mistake: When the Lockheed Jetstar is flying, it has an antenna with only one vertical tip that looks like a shark fin. Once the plane is on the ground you can see that the antenna is different and has two horizontal tips, similar to those antennas seen on limos or on the 'Fokker F-27' / F-28 models.