When MacGregor boards the La Quila, he's dry. Shortly after as Joachim attacks in his submarine and Frank tries to dodge, he appears with wet clothes and hair. This is due to a deleted scene (labeled as "MacGregor Water Skis" on streaming and Blu-Ray bonus features) in which he goes overboard, but is rescued by Lily.
In the submarine chase at the start of the journey the crew were seen loading the starboard torpedo tube but fired the port tube.
The protagonists' journey is to travel upstream on the Amazon. However, one of the obstacles they encounter is rapids and waterfall going *downstream*.
The traffic in Piccadilly Circus is shown travelling in both directions on the western side as it does today. In 1916 Piccadilly Circus was a roundabout and all traffic would have traveled in a clockwise direction around it.
Prince Joachim is supposed to be the youngest son of Kaiser Wilhelm II (indeed, the real youngest son of the Kaiser was named Joachim), yet he is wearing the double-headed eagle of the Russian Imperial Crown as the ornament around his neck.
The electric ceiling fan was invented by 1916, but not used in hotels until at least the 1920s. It was not used in ceilings of average height in private residences until the 1940s in the US, let alone in the middle of the Amazon Jungle in 1916.
The German Highness uses an non-blasting machine device to generate the charge needed to detonate the explosives which was not possible in 1919.
When fighting the thugs that first try to kidnap Lily at the harbor, the pot Frank uses to hit one of the men bends and wobbles when placed on the man's head, as it made of rubber.
When Frank and Lily are getting into the automobile at the end of the movie, you can see two British Union flags in the background that are displayed upside down.
How is it possible for the youngest son of Kaiser Wilhelm II to be present in London in the middle of World War I?
Frank makes a joke about concentrated orange juice that was not invented for another 32 years.
The movie uses the Real (R$) as the currency. But Brazil had several different currencies throughout the years. The Real has been in use since July 1st 1994.
In 1916, when the movie is set, the currency should be MIL RÉIS (Rs)
The bills are for the correct currency but the ones used are from the version printed in 1929. 12 years after the period the film is set. Not the version that would be in circulation in 1916.
In 1916, when the movie is set, the currency should be MIL RÉIS (Rs)
The bills are for the correct currency but the ones used are from the version printed in 1929. 12 years after the period the film is set. Not the version that would be in circulation in 1916.
The first page of the credit shows a budgerigar which are native only to Austrailia and not found in the Amazon.
Prince Joachim knows where the trapped Spanish are located. There was no record of this because only Skipper knew where he trapped them.
Early in the movie, Nilo's thugs repossess Frank's boat's engine, a standard V-type diesel, to settle an unpaid loan. Later, after the engine is taken back and re-installed, instead of throttling up the diesel engine, Frank opens the firebox of a separate steam engine and throws in wood fuel in order to accelerate to top speed.
The Amazonians knockout MacGregor, Lily, and Frank - in that order - with tranquilizing darts. Though it later turns out whole thing was a ploy to get the arrowhead and Frank was in on it. There was no point knocking him out when the Houghtons were already unconscious, thus couldn't have seen it happen.
Frank urges Lily to take a bath in the river, but knows there are piranha in it.