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)
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.
Factual error: Linda Koslowski dips her canteen in a creek and a full grown crocodile grabs it and tries to drag her into the water - and she holds it off in a tug of war until our hero Mick arrives and kills it. Nonsense. A slightly built woman has a much chance of holding her own against a 1200kg croc as I have of flying to the moon. She'd be croc food before he even heard the splash - a croc that big could take a 1000kg buffalo without pausing for breath, never mind a small woman.
Audio problem: In the scene where Mick returns from the corroboree and Sue asks if he is telepathic, in the US version of the film, he responds with "You're a woman and a reporter, that makes you the biggest busy body on earth". In the Australian version, instead of "busy body", it is "sticky beak" which means nosy in Australian speak. In the US version, you can see him mouth the words "sticky beak", but it is dubbed with "busy body" for American consumption.
Factual error: Not only do we have to question why the croc doesn't just pull the woman into the water, which is covered by another mistake. But, why does the strap on the canteen not break during this scene as well - it's probably got about 1500 pounds pulling on it.
Audio problem: When Mick first meets the two hookers outside the bar, their pimp walks up. He then makes the comment to Mick, "You gonna talk all night, or you gonna screw one of 'em?" Watch the pimp's mouth. He very obviously starts to say something other than "screw" as he mouths an "f" sound. But the camera clicks away to Mick's face and you hear the word "screw". Later in the movie the "f" word is used by the pimp. Must have been a post production edit to keep the PG-13 rating from becoming an R rating.
Continuity mistake: When Dundee enters his NY hotel for the first time, he is smoking and puts the ashes on top of his hat because he cannot find anywhere else to put them. In the next shot, the ashes are no longer there.
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.
Visible crew/equipment: During the opening credits, when Sue steps down from the helicopter, the filming crew is reflected on the cockpit glass.
Continuity mistake: As Mick gets up after Nevil leaves, he has a white tin cup in his hand. A second later, after the angle change, it's suddenly gone.
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.