Continuity mistake: When Indy and Helena find the antikythera in Archimedes' tomb, it's covered in dust and no features are visible. When Indy reaches for it, it's just slightly dusty.
Continuity mistake: Indy rides on horseback through a banner held by a women and rips it apart. The shot changes, and the women and the broken banner have all disappeared.
Audio problem: After Wombat greets Indy at the bar, from a side shot her jaw is moving, but no sound is heard.
Continuity mistake: Indy closes the cap of the whisky bottle and watches the separation agreement. The shot changes to a close-up, and he is closing the cap again.
Continuity mistake: A woman is shot at at the college and lies down with her right leg bent. A man tries to move her but is killed before he does. The shot changes and her right leg has swapped to lying straight.
Continuity mistake: During the chase in Tangiers, after the stolen watch discussion, Indy's tuk tuk stops next to a street where a man approaches. The shot changes and the street is replaced with a wall and the man is gone.
Continuity mistake: When Indy is abducted during parade day inside the truck, his hairstyle keeps changing all the time.
Revealing mistake: During the flashback scene, when young Indy jumps on top of the train and runs on the roof of the carriages, it's a very obvious and lame animation with unrealistic movements.
Factual error: Colonel Weber is not an Oberst, but an SS-Oberführer. Given all his men are also SS, there is no likelihood they would use an army rank to address him, especially one that is junior to his actual rank.
Other mistake: The US forces that apprehend Voller in Tanger carry modern-day M4 carbines. These weren't in use until the early 1990s. While similar weapons (XM177) were in limited use in the late 60s, the troops sent to apprehend Voller would much more likely have had regular M16s or WW2 M1 carbines.
Factual error: The cutscene when Indy travels to Morocco shows a clip of a train traveling at high speed through the desert. These are actually Belgian-manufactured trains and didn't operate in Morocco until around 1990, while the film's plot takes place in 1969.
Factual error: The plunder train is revealed to have travelled through the French Alps, when it was captured by the British. However, this would've meant the train was travelling through areas that still would've been under the Vichy regime. Most of these areas, while they did face Allied bombing, were liberated by French troops, not British. (The British and Americans were more concerned with heading for Germany).
Revealing mistake: When the AA machinegun on the train goes berserk and destroys everything, Indy hides behind some crates. For several shots, Harrison Ford is replaced by a lame CGI, which transforms his head into a videogamish, lifeless face.
Revealing mistake: When young Indy jumps from his car to the motorbike and fights against a German - and the following scene where he rides on the bike towards the train - his body and especially his face are a blatant CGI creation with unnatural movements, dead eyes, and waxy, lifeless expressions (most noticeable in theater screenings). (00:05:53)
Continuity mistake: During the parade, a red convertible skids and stops in front of Indy. Shot changes and it's skidding and stopping again.
Factual error: In the prelude scene, when Indy enters the car where a number of German soldiers are having supper, the latter are singing "Lili Marleen", a popular soldier's song in the 1940s. The only problem here is that the song was banned in Nazi Germany from 1942 after its last performer, Lale Andersen, was found to have sympathized with Jews. With common soldiers singing it while a strict officer might burst in among them at any time, it would have meant extremely harsh penalties for them.
Answer: There is a bit of dialogue en route to the airport when Voller sets the instrument that says, "the first hand sets the destination," as in the time you want to travel back to. This would make the device completely absurd in principle if true (that's why I wanted to mark it as a plot hole/stupidity). Since it's supposed not to open portals but just detect them, it can't be that there are infinite portals for every moment in time you can choose to go back to (and they even close). The sky, while vast, is not infinite. We then find out that it is a trick since it is set to actually bring you to just one destination, but they don't know it yet.
Sammo ★