Indiana Jones and The Last Crusade (1989)

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)

Henry: Come on, Junior.
Indiana: Will you please stop calling me Junior?
Sallah: Please, what does this mean? Always with this Junior?
Henry: That's his name: Henry Jones, Junior.
Indiana: I like Indiana.
Henry: We named the dog Indiana.
Sallah: The dog? You are named after the dog.
Marcus: Can we go home please?
Indiana: I have a lot of fond memories of that dog.

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.