Audio problem: In the bar, when the man is shot in the face and burns alive he screams in pain, but he never opens his mouth.
Deliberate mistake: When Indy and Marion are sealed in the well of souls, they are completely cut off from the outside world. As such, other than the torches, it should be pitch black, but it is surprisingly well lit in there.
Continuity mistake: After Indy steals the idol, while he is hanging in the well, in the front angle his left leg is bent and already outside, in a quite comfortable and secure position; yet in the angles from behind both legs are inside, hanging loose.
Continuity mistake: After the plane takes off in the beginning, Indy sees the snake. His hands are grabbing at it, but a second later his hands are on the rim of his cockpit.
Continuity mistake: When Indy is driving the truck with the ark, a German tries to get in on the right side. Indy kicks the door open twice, and after the second time the top hinge of the door gives easily. The guy is half way dragging on the ground, holding onto the now askew door. Then in the next closeup, the door is hung correctly with the guy on it, and Indy kicks it again. The guy goes dragging again, and then he and the door fall off.
Continuity mistake: After grabbing the idol, the cave starts to collapse, filling the place with rocks and rubble. When Indy starts to run, from the angle behind the floor is clean, rocks starting to fall for the first time.
Continuity mistake: Satipo drops the whip half a meter away from the closing gate, then runs away. However, when Indy rolls underneath the door, the whip is laying right next to it.
Continuity mistake: In the submarine dock of Geheimhaven, Captain Mohler is a man with dark hair in his mid or late thirties. But during the procession, he seems to be much older, with grey hair.
Factual error: There's absolutely no way Sallah and Indy would be able to lift that 'lid' (for lack of a better word) off the ark. That thing is solid rock and would weigh close to a metric ton - and none of them look like professional deadlifters to me.
Factual error: When Indy is attempting to steal the Ark when driving the truck, one of the soldiers shoots him in the arm. Then another German punches him repeatedly in the same arm, causing Indy great pain and injury. After suffering a wound like that there's no way he'd be able to move that arm, let alone raise it above his head. But the next day after the boat is stopped by the sub, Indy jumps into the water and swims to the sub without any problems.
Continuity mistake: When Indy stands inside the Map Room, looking at the model of the city, the rays of the sun are to his left, and they move right and down as the sun rises. But since the entry hole is behind him, that would mean that the sun would be to the right when standing outside - but it was to his left when he entered the hole.
Continuity mistake: There is a shot during the truck chase scene where a Nazi falls out from the back of the truck and goes through the windshield of the car behind it. During the shot from inside the truck, we see two Nazis to the left. The one closer to the camera pushes the other one down. However, in the very next shot, we see that pushed-down Nazi immediately sitting up straight.
Continuity mistake: When the temple collapses, Indy is holding the idol with his right hand against his chest, and the left hand free and arm extended. A frame later, both arms are extended and holding the idol.
Continuity mistake: While Indy is in the Well of Souls, Belloq greets him and is standing by one of the four sides of the rectangular hole. A frame later he stands by one of the corners.
Continuity mistake: From the outside, the sides of the hole to access the map room are in shadows, from the angle inside they are sunny.
Continuity mistake: During the truck chase scene, the radiator bars Indy hangs onto keep swapping back and forth from bent outwards to slightly bent with no continuity at all.
Continuity mistake: Just before they swing over the chasm to retrieve the statue, the man accompanying Indiana Jones (Satipo) is holding a flame torch. When they swing over the chasm, Satipo is no longer holding the torch.
Suggested correction: That's because he simply discarded the torch. He probably dropped it when he saw the corpse come out of the wall or did it later as they were walking further. It's also not "just before they swing"; there is a long time passing between him holding the torch and seeing him without it.
Continuity mistake: Or perhaps just algorithm: When Indy and his friend are delving through the webbed cave in search of treasure, the friend turns a bit to reveal a pile of tarantulas suddenly covering his shoulders, descending his chest, the same as Indy, who suddenly turns, revealing his backside covered in them. When cut, prior, their backsides were empty. The spiders didn't just fall from the ceiling onto their backs; we would have seen this. Purely for creep factor and nothing more.
Continuity mistake: When Indy is in the map room, he clears off the slot where the staff is supposed to go, right in front of a jagged line. However, in the split-second shot of the staff being inserted, it's not in the same hole. It's a bit to the left.
Continuity mistake: When Indy comes face to face with the snake in the Well of Souls, the stone rubble from the Ark cover is on the stairs leading to the Ark, which was later smashed on the stairs as Indy and Sallah were removing it. A few moments later, as Indy is filling the gas pump, the stone rubble is no longer there.
