Goofs

(at around 51 mins) When Milo and Kida are trying to figure out how to power to the vehicle using Kida's crystal, the crystal is removed from around her neck to power the vehicle. In the next shot the crystal is around her neck again and still powering the vehicle. And again in the next shot the crystal is missing, and replaced again in the next shot.

While on the highway to Atlantis, several times Milo has to take off at a run to escape something and he never has anything but his clothes with him. Yet when he reaches Atlantis he still has his book and his satchel though he didn't have them before.

(at around 11 mins) In Whitmore's room, when he's explaining why he's funding the Atlantis trip, he smacks the painting above the mantelpiece with his cane at his head is level with, or above, the mantelpiece. However, in the next shot, his head is at least a foot beneath the mantelpiece.

(at around 41 mins) When the travelers first arrives at Atlantis, they all step in front of the large "digger" machine to get a better look at the city. Then we see a wide shot of the city and travelers and the digger is nowhere to be found.

(at around 13 mins) When Milo is first seen on the ship, he vomits over the side, losing his glasses in the process. In the next shot they can be seen safely resting on his head.

The expedition's submarine, the Ulysses, is apparently powered by steam. This would be impossible for any vessel traveling underwater. The fires from the boilers would consume all of the air in the vessel within a fairly short period of time, leaving the vessel without power and the occupants asphyxiated.

(at around 5 mins) When Milo is rehearsing his proposal in the museum basement, he rubs against the chalkboard and wipes the map he drew onto his clothes. He then stands in front of the chalkboard and the chalk map on his clothes matches the missing part of the map, when in fact it should be a mirror image.

Despite holding a naval officer's rank, Commander Rourke is seen wearing a green uniform and Stetson hat more in line with a US Army officer (which is apparently his background according to supplementary material). Possibly justified because he's actually a mercenary, and can presumably call himself whatever he wants.

(at around 3 mins) Revealing the location as the coast of Iceland instead of Ireland showed the same symbol for both the "A" and the "C" on the chalkboard. The Atlantean letter "C" matches the "C" in "Coast," but was translated as "R" before. Decoding must not have been a strong suit of the ancient Norse.

(at around 53 mins) Cookie tells Audrey that he has 'all 38 United States' as a tattoo. In 1914 the United States consisted of 48 states, but Cookie probably got his tattoo years before, maybe when the United States did consist of 38 states - between 1877 and 1890.

In several scenes, the submarine's crew are seen wearing gas masks akin to those developed for trench warfare. Gas had not been deployed as a weapon yet, but the concept of a gas mask dates back to the 9th century. A gas mask was patented in America in 1849 by Lewis Haslett, for filtering dust. Furthermore, the African American inventor Garrett A. Morgan invented a gas mask in 1912 that proved useful for gas/smoke-filled environments. Military use of gas masks did not occur until at least 1915, but Rourke runs a private army with unconventional equipment, to say the least. It is not difficult to imagine him or an associate seeing the need for protective masks in a dusty, potentially gas-filled underground environment.

(at around 11 mins) When Milo is handed the Book of The Shepherd you see Mr. Whitmore's huge aquarium, containing some Coelacanths. The Coelacanth was only known from fossils until a live specimen was caught in 1938 in Chalumna River. However, a recluse like Whitmore might have made the discovery on his own and refused to tell anybody.

(at around 9 mins) The huge picture of Mr. Whitmore and Milo's late grandfather above the fireplace is in color. In those days all photos were black and white.

The above is incorrect: colour photography had been developed well before 1914 so a colour portrait is not a goof.

(at around 19 mins) Near the beginning, Audrey is seen chewing bubble gum, invented in 1928 by Walter Diemer.

(at around 14 mins) Just before the launch of the ship, Cookie complains about having to carry non-essentials on the trip. One of the non-essentials he mentions is "cilantro", however, in 1914 this seasoning would have been referred to as "coriander leaves".

(at around 31 mins) During the campfire dinner, Cookie says that a Caesar salad is on the menu. The movie is set in 1914 and the first Caesar salad wasn't tossed until the 1920s.

(at around 57 mins) In one scene, "Mole" can be seen holding a PPSH-41, a gun invented in 1941 by the Soviet Union.

(at around 6 mins) When Milo is trying to talk to Mr. Harcourt in the beginning of the film, there is an Uncle Sam poster outside. This poster design wasn't seen until 1916 and the US hadn't entered WWI until 1917. This movie takes place in 1914.

The subtitle The Lost Empire makes no sense in the story context. Atlantis never ruled over other countries, and its head of state did not use the title of Emperor.

(at around 32 mins) Milo speculates that the Shepherd's journal's description of Atlantis's power source ends abruptly, due to a missing page, while flipping between the front of the page where it ends and the back of the same page, containing unrelated text. A missing page is clearly impossible.

(at around 12 mins) Mr. Whitmore claims the crew he has hired were the same team that retrieved the journal in Iceland. However, the photo Whitmore shows Milo does not include Audrey and the man seen in her place is implied to be her father who as mentioned by Audrey is retired.

(at around 8 mins) Helga tells Milo, "Don't drip on the Caravaggio." Michelangelo da Caravaggio was a painter, not a type of carpet.