Deliberate mistake: While Indy is fighting the tank commander, he looks up to see them heading toward a cliff. After the tank goes over, from the time his companions look over the cliff to the time when they walk away and Indy is sitting on the ground, you can see the wind blowing in their faces. But as Indy starts to get up, the wind blows his hat toward him, which it couldn't do as his hat flew off quite a while before, and the winds would have blown it far from the cliff's edge.
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: When Indy asks his father how he knew Elsa was a Nazi, Henry replies, "She talks in her sleep." Sean Connery ad-libbed this line. The cast and crew burst out laughing, which resulted in the scene being re-shot. The ad-libbed line remained in the film.
Question: It seems that going after the grail diary in Berlin was just a plot point. Henry obviously knew about the trials in the cave by heart. The search for the holy grail has been a hobby of his for 40 years or so. Am I right?
Answer: Neither Henry or Indiana would want the diary to remain in German hands. The Nazis wanted the Grail to exploit its power. As Elsa was a German scientist, she'd already gleaned enough knowledge from Henry and Indy to utilize the information contained within the diary. The diary also contained considerable data about the Grail and its history that Henry had researched over the years and would not have memorized and wanted to retain. He would also want to pass it on to Indy.
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Answer: Henry says, in response to Indy asking if he remembered the details of the trials: "I wrote them down in my diary so that I wouldn't have to remember." So, obviously he did NOT know them by heart. Also, as the other answer says, they didn't want the diary to either be in the Nazis' possession or be burned.