Another reason why I don't buy the idea of him starting to use Henry because of his reconciliation with his father: It was by using the name "Indiana" that his father got through to him at the end of Last Crusade. We might basically view this as the essential summation and completion of their reconciliation. And yet, after they're outside the temple again, when Henry calls him Junior, he says something like, "Junior? Dad...", obviously annoyed at it. And then Sallah asks what's with the Junior, and Henry says, "That's his name, Henry Jones Jr." and Indy says "I LIKE Indiana", Henry says, "We named the dog, Indiana", and Indy says, "I have a lot of fond memories of that dog".

So even after the reconciliation at the end of LC, they still make it clear that he wants to keep using Indiana and not switch to Henry Jones Jr. KOTCS essentially contradicts the ending thoughts of LC - assuming it's even intentional that they don't use Indiana much - and make no effort to explain it - again, if it's anything other than a stupid oversight in the writing. Since "Indiana Jones" is the iconic and titular name of the series, changing it or failing to use it like it was used in the 3 others certainly needs some explanation. In my opinion, however, no explanation would be good enough considering the movie is called INDIANA JONES AND THE KINGDOM OF THE CRYSTAL SKULL

Ryan