Koepp is under strict orders not to reveal any of the plot twists in the film: "I spent about a year on it, first doing drafts with Steven and then doing drafts with Steven and George," he explains. "It was a lot of fun. The first thing is that you realize this is a beloved character, probably one of the most in film history, and a lot of people are going to be angry no matter what I do."
Koepp agrees that it would be crazy not to take into account star Harrison Ford's real age for this next installment. In fact, he suggests that if it were not in the script, Ford would likely insist on references to this being added.
As much as he is a fan of Indy lore, Koepp says it's essential to discard that point of view when tapping out further adventures. "You can't write a fan script," he insists. "You have to pretend that this movie exists without the other one." "The worst thing to do would be to have him make reference to things he said in the first movie, like to pun on lines of dialogue,"
"People have a lot of preconceptions about what it ought to be and that's the same kind of pressure you feel with Indiana Jones," he continues. "It's hard to write when you feel the audience looking over your shoulder, but you just try and put it out of your mind."
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Indiana Jones 4 is expected to be released in 2008.