When Brozzie is supposedly in the water with the crocodile, you can see that it isn't her. It is actually Steve Irwin in a fat suit and wig.
When the CIA Agent is being dragged by Steve Irwin and Terri Irwin's truck during one shot you can see the edge of the hidden board upon which the stunt man is actually riding on.
When Steve Irwin and Terri Irwin first attempt to catch the rogue crocodile in the river, during several shots you can see that the river bank is concrete and fake rocks.
When Brozzie is hunting the crocodile she falls out of the tree and is supposedly holding herself up by one hand, you can see the harness under her shirt, and the strap that's really holding her up.
One of the characters at the CIA remarks that they lost the signal from the satellite over Queensland, Australia. However, in a subsequent view of the satellite, it is seen hovering over the Southern Ocean, apparently headed north towards Australia. This would mean that the signal was lost while the satellite was nowhere near Queensland.