Trivia: The filmmakers discovered to their chagrin that the snakes used for the Well of Souls sequence weren't afraid of fire at all - in fact, they would always try to get closer to the fire to warm themselves. At one point director Spielberg was caught on camera picking up a snake and telling it, face to face, "In the script, you're supposed to hate fire. Why do you like fire? You're ruining my movie."
Trivia: On the plane to Nepal, the guy with the Life magazine is Visual Effects Supervisor Dennis Muren.
Trivia: Another THX-1138 reference from George Lucas: When Indy gets off the Nazi Sub inside the hidden dock, you can hear over the loudspeaker, "ein, ein, drei, acht." (German for one-one-three-eight.)
Trivia: The scene where Indy shoots the sword wielding bad guy wasn't in the original script. Three months' shooting had resulted in Harrison Ford having a nasty case of dysentery, and the choreographed fight would have taken three and a half days to shoot. Harrison Ford really didn't want to stay on set that long, so suggested that it would be a good alternative if he just shot him. Who actually suggested the change isn't certain, but it wasn't a spur of the moment decision, contrary to some thoughts - it was a planned alternative.
Trivia: Pat Roach (the bald German mechanic in the fight at the plane) actually appears in all three films. He is a former wrestler, and is best known in the UK for playing "bomber" in "Auf Wiedersehen Pet".
Trivia: The film was originally given an "R" rating by the MPAA because of Belloq's death (his head explodes and showers everywhere). To overcome the ratings, Spielberg had flames superimposed over the image (although it thins slightly as the head detonates).
Trivia: When Belloq is yelling at Indy on the island from down in the canyon, you can see a fly crawling about his face. He doesn't flinch, nor does he make any attempt to shoo it. It eventually ends up in his mouth, and he still doesn't react. In editing they removed the few frames where the fly flew off, in order to give the impression Belloq ate it (http://www.theindyexperience.com/interviews/paul_freeman_interview.php).
Trivia: When the Nazis have taken the ark from the Bantu Wind (Captain Katanga's ship) and no one can find Indy (until he climbs aboard the sub), Spielberg actually filmed Indy diving off the ship and swimming all the way to the sub. Harrison Ford did the stunt himself, though the footage was never used.
Trivia: Indiana Jones could have escaped the rolling ball of rock by simply standing still, because the boulder started out about 15 feet over his head. Even if the boulder ended up blocking the entrance, there are several shafts of sunlight visible throughout the tunnel, indicating several potential points of escape.
Trivia: When a Nazi falls from the back of the truck carrying the Ark, a "Wilhelm scream" can be heard.
Trivia: The truck that Indy gets dragged under and the one that he blows up when he thinks he's killed Marion are actually the same truck. It was built specifically for the moving fight scene because they couldn't find a real truck that would work with all the stunts that were written for it. They used it again in the bazaar scene so that it would look like that type of truck was a common vehicle at the time.
Trivia: For the well full of snakes, Spielberg didn't have enough when they had the scene prepared, so he had several hoses cut up and disguised as cobras.