Continuity mistake: When Jim's car approaches the beggar on the sidewalk, in the wide angle Jim is sitting on the far right. In the close-up he is sitting on the far left.
Continuity mistake: Jim passes twice by the same part of the Gone with the Wind poster.
Continuity mistake: When heading for the costume party, when Jim leans to see the crowd, his hand is on/off the car's window.
Answer: I don't think anyone disliked Jim or was mean to him. Basically, he's a somewhat annoying, overly-active kid that the adults, who are in a very dire situation, simply didn't have much patience or the inclination to deal with. Also, the adults are mostly upper-class British, and in that era and before, they tended to be stricter with and more dismissive of children.
raywest ★