When Brozzie is supposedly in the water with the crocodile, it's obviously not her; it's actually Steve Irwin in a fat suit and wig.
The word "Trespassers" on Brozzie's sign is misspelled "Tresspassers"
When the CIA Agent is being dragged by Steve Irwin and Terri Irwin's truck, during one shot the edge of the hidden board upon which the stunt man is actually riding on is visible.
When Steve Irwin and Terri Irwin first attempt to catch the rogue crocodile in the river, during several shots it's clear 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, the harness under her shirt and the strap that's really holding her up are visible.
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.