Factual error: Mick's hat has genuine crocodile teeth set into the hat band. It would be confiscated and destroyed by US Customs on his arrival in the USA.
Factual error: That is not a crocodile that attacks Sue. It more closely resembles an American alligator - the squat, rounded snout gives it away. Australian crocodiles have a much sharper, more angular snout. There are other tell-tale physical features, most notably the placement of the alligator's teeth when it closes its mouth, but that's the main one.
Other mistake: When Nick and Sue go to the outback with Wally they go by car then by boat (the only way to get to where Mick was bitten, apparently). Once they are there the poachers from the pub appear on their jeeps to hunt kangaroos. So there was a direct way by car to the spot.
Continuity mistake: When Sue, Mick and Richard are in the restaurant, first Sue is holding her menu, the next shot she is holding Richard's hand, the next shot she is holding the menu again.
Revealing mistake: When the crocodile attacks Sue from the water, it holds on to her canteen for two shots. You can see that the animal actually holds on to a prepared version of the canteen - it is cut in half, with its lower teeth inside to hold it more "comfortably" during the pull.
Continuity mistake: At the beginning when the helicopter lands, the helicopter's shadow goes out toward the rear right of it (from the pilot's perspective), but when Sue grabs her bags and walks to Walter, the shadow is now cast to the front right. Since Sue got out and was standing next to it, the helicopter did not move in the meantime. (00:03:15)
Visible crew/equipment: During the opening credits, when Sue steps down from the helicopter, the filming crew is reflected on the cockpit glass.
Suggested correction: You can tell by the shape of the snout and the ridges above the eyes that, although animatronic, it is meant to be a Marine Crocodile that is native to Australia. It doesn't resemble an American alligator, which doesn't possess those pronounced ridges. Also, freshwater crocodiles can be seen in the boat ride scene where Mick motions for Sue to lean up off the edge of the boat. They have the narrower, angular snout that you referenced.
The placement of the alligator's teeth when it closes its mouth shows that it is more like an alligator than a crocodile. In fact, the animatronic puppet is a bizarre mish-mash of physical characteristics of both crocodiles and alligators.