Revealing mistake: When Nullah and his mother are being pulled out of the tank, the stitching on the dummy used for the mother is visible.
Continuity mistake: When Drover and Ashley are parading in the rain at the ball, there is a shot of Drover's all white clean shirt, specifically the arms. When they dance in the mud after it starts raining, it has some mud stains on one of the arms. Cut back later and the shirt is clean again.
Factual error: Outside the Territory Hotel, during the storm, and once earlier in the movie, the taxi cabs are shown with the modern "flip over" vacancy/hired signs that were not used then.
Continuity mistake: Shortly before the big cattle drive arc begins, Kipling Flynn pours a teacup full of rum for Lady Ashley to drink. The camera cuts to an over-the-shoulder view as Lady Ashley starts to tip back her teacup; at this point, you can see that the cup is completely empty.
Factual error: One can read in the newspaper "Standard" dated from Monday 11 May 1941 the headline "Germany urges Japan to enter war". The text below says that Germany urged Japan to attack the USSR as Berlin broke the non-aggression pact the previous month. But Germany attacked the Soviet Union on 22 June 1941, so the newspaper article should be dated July 1941. Besides, this information was top secret and could not have appeared in a newspaper in May 1941.
Factual error: During the attack on Darwin, Army signs display "19th Infantry Battalion". The 19th is a World War 1 unit. In the Second World War, the Second Australian Imperial Force was raised and the 2nd 19th Infantry Battalion AIF was formed. The correct citation is 2/19 Infantry Battalion. Also, the bombing of Darwin occurred on February 19, 1942. The 2/19 Inf Bn AIF was captured in Singapore on 15 February 1942.
Other mistake: In the scene showing Fletcher hanging over the wreckage of an anti-aircraft gun after he was speared, the camera flies up above the gun looking directly down the barrel. The plug welded into the barrel to deactivate the gun under Australian gun legislation can be seen.
Factual error: In the scene where the Japanese are attacking Darwin, the American Battleship USS Oklahoma is shown being bombed and torpedoed. The USS Oklahoma capsized after being attacked at Pearl Harbor several months earlier. This appears to actually be a piece of a scene from the 2001 movie "Pearl Harbor".
Continuity mistake: When Drover is swinging the lasso in the rodeo pen, he starts off with the lasso in his right hand. In the next shot it's in his left, and in the last shot it is back in his right.
Revealing mistake: When Fletcher is killed by King George, the spear can be seen as computer-generated; Fletcher swings his arm back and forth, through the spear. At one point, he even pauses, with the spear in his arm.
Factual error: At the beginning of the film, the map of Europe is not from September 1939, which should be showing Nazi Germany, including east territories and Austria. It's from 1993 or later, showing the democratic Federal Republic of Germany after its reunification. The modern map has just been covered by a Nazi flag.
Other mistake: The union jack being raised at the beginning of the movie is actually being raised up-side-down - a very common error. Wide white band must be uppermost near the pole.
Continuity mistake: During the cattle drive Nullah starts out by riding a Skewbald (brown and white) horse but in subsequent shots the horse is Piebald (black and white). In later scenes the horse remains Piebald but the pattern of the markings changes between shots indicating that the pony was actually grey.
Continuity mistake: In The Territory Hotel, after the bombing of Darwin, Drover invites his aboriginal friend into the bar for a drink. The barman pours half glasses of rum, but when they lift them to their lips, the glasses are full.
Other mistake: The stirrups on the horse that Nullah (the young aboriginal boy) finds at the beginning of the movie are perfectly adjusted to his leg length, even though the previous rider was an adult.
Factual error: The cattle used in the film are a Santa Gertrudis cross breed. These were originally bred in USA & brought to Australia around the 1960's.
Factual error: The Australian Army slouch hats worn in the film show a folded cotton puggaree. An unfolded felt puggaree was replaced by the folded cotton puggaree in 1942, mostly mid to late 1942. The soldiers are shown wearing the folded cotton puggarees in late 1941 and February 1942.