Continuity mistake: Inside the waterfall, Ox takes out the skull, moves his hand from the top to the side of the skull. The angle changes and the hand remains on the side, but when the angle changes to behind Ox his hand is on top of the skull, repeating the first movements.
Continuity mistake: Inside the waterfall Ox takes out the skull while Marion watches from behind. When the angle changes, her hand is suddenly on his shoulder.
Continuity mistake: Indy uses a huge rock to smash the stone where sand is coming out and hands the rock to Mac. From one shot, Mac falls backwards and sits down, but from a different angle he is standing up slightly crouched.
Continuity mistake: Ox takes out the skull, Marion walks behind him, moving to a corner on the right. In the next angle Indy says, "Ox, I think I understand" and Marion is suddenly gone, only to magically reappear a frame later.
Continuity mistake: When the Akator temple starts to move, the sand by the groups' feet keeps changing from sandy with a couple of rocks, to filled with weeds and leaves, and back to sandy.
Continuity mistake: Inside the waterfall temple, the group walks by a room (with a passage on each side and a double entrance with steps in the middle) where natives appear and columns and walls fall off. The angle changes to a seemingly new room, but it's obviously the same place, with the camera angle slightly turned to the right. All the previous people are magically gone, the debris has disappeared, and natives are coming out of different places. Really odd editing. (01:30:35)
Continuity mistake: In the alien room, Spalko walks to Ox to take the skull away from him. In the first angle Marion is standing to the left of Ox, but in the immediate close-up she is behind him.
Continuity mistake: Mutt says, "We have to cross the waterfall," and extends her left hand. From the opposite angle, a frame later, he is extending the right arm.
Continuity mistake: When the Russians arrive at the barrier the sky is either sun setting, bright and sunny, or cloudy, depending on the angle.
Continuity mistake: When Indy finds out that Mac has betrayed him, Mac is standing half a meter away. Right after, from a different angle, he is 10 centimeters away, with the tip of his rifle touching Indy. And right away, from yet another angle, the gun is on top of Indy's shoulder.
Continuity mistake: In the Nevada warehouse,when Spalko is opening the corpse bag, the amount of smoke coming out swaps from a lot to zero depending on the angle, without any logical sense whatsoever.
Continuity mistake: In the Nevada warehouse, the first angle of the corpse's hand shows the baby, ring and middle finger together. When the angle changes, the position of the fingers is completely different, with the baby finger now totally separated from the rest.
Continuity mistake: When Mutt is pulling Indy out of the quicksand both are inches away from each other. A frame later Mutt is meters away in a different position, as if he had fallen backwards.
Continuity mistake: Indy's car crashes face to face against Mac's, destroying its front. When Indy runs away there's a view of the car and the damages are minor.
Continuity mistake: After Mutt falls from the ladder in the graveyard, a native jumps from above to attack him. Indy is already on the right side of the scene, walking out, but when the angle changes he is standing on the left side, very close to Mutt.
Continuity mistake: When Mutt's ladder to the temple ruins breaks and he falls to the ground, the position of the broken parts around him keeps changing positions between shots.
Continuity mistake: In the warehouse, after Indy throws Spalko out of the car he is about to crash against Mac, who grabs the car's window totally panicked. A frame later his hand is away from the window.
Revealing mistake: When Indy's car is about to crash against Mac's, there's a wide angle where the car is seen totally black inside, revealing it's empty.
Continuity mistake: In the graveyard, Indy hits a native with a shovel and knocks his mask and wig off, revealing a short thin hair. A frame later, when the native escapes, his hair is back to fuzzy and long.
Continuity mistake: In the Nevada warehouse, when Spalko opens the corpse's body, its hand is covered in a white dust. A frame later it's clean.
Chosen answer: Because the film had a global release date, and premiered the same day in every country in the world. Obviously, the studio felt this was the best day to do it.
Twotall