Continuity mistake: Leo Marvin is at the window watching Bob 'leave' and he is holding the newspaper in his left hand. Then he waves and it is still in his left hand. When he walks towards his family it is in his right. He could have switched, but that is some pretty fast switching.
Suggested correction: He could have switched. It, for me, wasn't that fast.
I agree. It wasn't a continuous shot, and he's off camera for 3-4 seconds before we see the paper switch hands.
Plot hole: When Dr. Marvin is trying to get Bob to leave the night before his television interview, he can't leave because it's pouring rain. He also can't drive him because their car was left at the boat dock. However, Dr. Marvin could have easily called for a cab to drive Bob back to where he's staying.
Suggested correction: This assumes that there is a taxi service in the small town in which they reside.
This is obviously a tourist town, which would likely create the need for a taxi service.
It also seems to be a fairly secluded and very rich tourist town with cars almost necessary to get around.
Suggested correction: At that time of night in that condition, I highly doubt calling a taxi cab would be easy, especially since Bob lives right down the road, no taxi far away would come just to drive someone a short distance like that.