Resentment of Indy by Mutt
Does it seem that Mutt is very resentful of Indy?
Even in the Jungle scenes, where he sarcastically calls him "Daddy-O" or mocks the idea that his father is "Just, just some--SCHOOLTEACHER?" or even at the end, when Indy says, "Why don't you stick around, JUNIOR?", to which Mutt replies, "Why didn't you...Dad?"...That would normally, in a film or real life be a very awkward exchange, yet in the movie Marion greets it with a big cheesy grin as does Indy...I mean even in that last spoken comment with them, he seems resentfull--"Why didn't you stick around?"--More resentful than Indy was for Henry. I'd say there might even be a hatred of Indy on Mutt's part.
And I could see Mutt betraying Indy, perhaps to his death, out of resentment (for example for being forced to go back to school) in Indy V.