The more I think about this opening, the more I hate it. In fact, it's by far, my least favorite opening of the quadrilogy.
The fact that Indy gets his phobia of snakes, his scar, the whip and the hat within that period of time in just one day not only is unbelievable, I really think it cheapens the character of Indiana Jones as he's suppose to be a legend in that he has so many elements of his costume and character that are mysterious and that you never quite know how he got them and assume he got them with various different adventures, so it really gives you the sense of history that Indiana Jones has and all the many adventures he has been through. The fact he just got them all in just one coincidental event in just an hour or so rather cheapens that sense of mystery Indy has.
I also hate this opening because it literally has nothing to do with the movie. Sure it somewhat establishes tension Henry and Indy have always had against each other, but just think the large improvement this movie would've had the opening been stretched out as flashbacks through-out the movie, that not only would establish his relationship with his father better, but would've expanded Indy's adventurous resume having separate occasions to when got a phobia of snakes, his hat, his scar and fedora, and not make it a a part of a very forced opening 5-10 minutes.