These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fair for Its Day - Kindness towards the disabled was a theme in some of the books, putting them a little ahead of their time. Also, one of the boys learns the hard way that girls aren't all the gender stereotype he'd assumed they were (in this case, easily grossed out and frightened of bugs).
Values Dissonance - The treatment of girls and some racist elements show the time the books were written. This could be one reason a tomboyish girl was added in the movies.