My biggest complaint is the use of dubbing and speeding up playback
A lot of this movie was dubbed. This is a common practice these days but generally done so well you don't notice.
But this just sounded weird and looked out of sync.
Then the speeding up of so many shots. From cars crashing to sharks swimming to the crazy hyper speed boat at the end.
Did audiences fall for this back in the 60s?
You can only speed up film by 10% or so and get away with it. This is like x2 or x3 in some scenes.