Continuity mistake: When Indy and Mutt first meet in the diner scene, look out the window behind Indy. A group of leather-clad bikers are sitting and talking on their motorcycles. They vanish and reappear at least three times during the scene.
Factual error: When Indy is getting decontaminated after the atomic explosion, the workers are using the M17 protective masks. These masks were not in use until the late 1960's.
Continuity mistake: In the jungle chase scene, Indy and the others blow up the front-running plough machine. They then continue to drive around in a ploughed jungle alley. They should be hitting a lot of trees.
Continuity mistake: Just before the Russian backhands Indy in front of the warehouse at the beginning of the film, his hands are crossed behind his own back, but immediately in the next shot, they're crossed in front of him.
Continuity mistake: After visiting Ox's jail, Indy arrives at the ruins and it's pitch dark. He enters the burial room several minutes later and sun beams are now coming through the ceiling.
Factual error: During the fight in the rocket engine testing facility, the countdown timer has electronic digital numerals. In 1957, the countdown timer would have had flipping numbers, which are mechanically changed as the timer counts down, or a nixie tube display. See films like Fail Safe and Goldfinger for examples of such clocks or timers. LED's weren't even invented until 1962.
Continuity mistake: When Mutt slams his fist on the table in the diner, the ketchup and mustard bottles fall over. When the shot pans to Indiana's back, the bottles are standing up again. He then tells Mutt to sit down and the camera pans back to Mutt. The bottles are lying down again and Indiana picks them both up.
Continuity mistake: When the gang arrive at Akator, and Indy pulls the first rock from the wall and sand starts pouring out, Mutt runs out from that shot to find himself a rock but in the next shot, when Indy says to Mac, "Go get your own!(rock)", Mutt is suddenly back in the shot and runs off to find a rock, again.
Factual error: When Mutt throws the snake to Indiana Jones in the sand pit, it's an olive python (which he misidentifies as a rat snake). But olive pythons are not native to South America - they're Australian.
Continuity mistake: In the opening scene with the drag race, the lead car in the caravan speeds ahead in response to the challenge. In the next scene, the caravan turns right and the challenger continues straight. At this point, the entire caravan is together despite the fact that the lead car would have been far ahead by that point.
Continuity mistake: When they fall into the water, while the stairs disappear, the skull splashes twice.
Factual error: In a shot of the exterior atomic test homes, we see child dummies playing on a Slip-n-Slide. That toy was not introduced by Wham-O until 1961.
Other mistake: When Mutt is riding his motorcycle the first time he meets Indy at the train station, his hand is pulling in the clutch as he rides. But with the sound and speed of the bike, the clutch would have to be out.
Continuity mistake: When the civilian car is chasing the military convoy approaching the Nevada test site it crosses the convoy between the third and the second truck. It then passes the next two trucks on the left. In the next shot it is again behind the first truck. (00:00:55)
Continuity mistake: After the duel between Mutt and Irina Spalko, Mutt falls down into the car with Indy and yells, "She's getting away!" as she is seen driving off. However, in the following shot when they are driving near the edge, Irina comes from behind them.
Visible crew/equipment: During the jungle chase, Marion jumps out of the truck, leaving Dovchenko driverless. A few shots later, Spalko fires on the two amphibious vehicles, and when Mac removes his cap to check his head, the actor's modern wired device (earbud or mic perhaps) drops out from under his scarf/shirt and hangs over his shirt. Later, in the chamber with the crystal skeletons, Mac admits to lying about the CIA, then as Spalko climbs the chamber stairs, it looks like her lav mic is a bit visible between two upper buttons. (01:17:10 - 01:44:15)
Factual error: The Russian soldier would not be able to scream with ants running into his mouth - he would be choking.
Factual error: In the wedding scene, the minister uses the modern, politically correct "I now pronounce you husband and wife" instead of the traditional "man and wife" - unheard of in 1957. (01:54:50)
Continuity mistake: When Mutt and the Russian woman are fighting in the normal view, you see the the AK-47, but when it changes to overhead, it disappears.
Continuity mistake: When Indy and Mutt meet in the diner, the spoon on the table changes its position between shots.
Answer: Yep, you've forgotten some details. The Knight specifically states that the immortality bestowed by the Grail is limited to those who remain within the shrine. Jones Snr left the cave, ergo, no immortality.
Tailkinker ★