Revealing mistake: In the catacombs of the library, Indy and Elsa are waist deep in petroleum. Indy has a torch, and if you look carefully, you will see burning pieces of the torch fall and hit the petroleum. Wouldn't this start a fire as Kazim later on sets the cavern alight with a single match? (00:34:05)

Indiana Jones and The Last Crusade (1989)
Trailers
Directed by: Steven Spielberg
Starring: Alison Doody, Denholm Elliott, Harrison Ford, John Rhys-Davies, Julian Glover, River Phoenix, Sean Connery
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[Over the deafening noise of ship engines.]
Indiana Jones: Are you crazy? Don't go between them!
Dr. Elsa Schneider: Go between them? Are you crazy?
Trivia: Hitler was played by the actor Michael Sheard, this was the third time he had played Hitler for film and TV. Ironically, Sheard's wife was half-Jewish.
Question: Are Indiana Jones and his father immortal at the end of the movie or does the grail's power become null and void when it crosses the seal? The knight said something like "The grail cannot cross the seal, that is the price of immortality." That makes it sound like they are not immortal at the end but I still want to check.
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Chosen answer: They're not, no. An individual doesn't become immortal after one drink - it requires them to drink regularly in order to remain alive. So neither Jones has been rendered immortal, merely healed of any wounds that they might have. But your surmise is basically correct - as the Grail cannot leave the shrine, any individual wishing to use it to prolong their life must stay there if they wish to enjoy its effects.
Tailkinker
Also, in Indiana Jones and the Kingdom of Crystal Skull, Henry Jones, Sr has passed away before the start of the story and therefore was not immortal.
raywest