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.
Question: They didn't make it out of the cave with the grail because they dawdled... I wonder, would someone be able to make it out running at a dead sprint once they crossed the seal? And if so, does that mean that they're home free? Or would disaster follow them outside of the cave?
Question: In the desert the tank first shot towards the Joneses. Then one of the bad guys implied that they hit their vehicle, by saying they couldn't get out of the desert on foot. How did they know? The vehicle wasn't visible from their location.
Question: Why did the zeppelin turn around, and how did the approaching airplane fighters know it was them in the zeppelin's airplane?
Question: When this film was being released, I read a rumour somewhere that Lucas originally wanted actor John Houseman to play Indy's father. Given that at the time Houseman was in his mid-80s and in poor health (He passed away when the film was in production), was there any truth to this story?
Question: What happened to the Grail Knight after the events of the movie? Did he become mortal again (due to not having the grail to drink from) and die or did he manage to retrieve the grail?
Question: In the first half of the movie, the problem that needs to be solved is where the known route starts. Indy finds out when he finds the second, complete shield in Venice and deciphers it later. When exactly do the Nazis find out? He has told Marcus Brody, but not Elsa, because he does not fully trust her. The Nazis find the diary, but not the rubbing. They don't "extract" the information from the Joneses when they are captured in Austria, at which time Indy confidently states that Marcus has a two day head start (unless the Nazis know something that Indy doesn't). But they are already waiting for him in Iskenderun when he arrives. (No indication is ever given that Marcus is being followed in Venice; at any rate, no-one pays much attention to him, because all eyes are on Indy.) When and how do the Nazis discover where to go?