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.
Alternate Character Interpretation: a critisism that is almost as old as the book itself is that rather than the modest humble, honest narrator Dickens intended Esther to be, she comes across as unbearably pious, priggish, disingenuous and self-serving. Her attitude towards Ada sometimes seems more morbid, controlling obsession that the simple sisterly affection Dicken's meant, and her actions sometimes seem willfully self-harming. However, even her harshest critics could hardly fail to lose all sympathy for her, as the parts of the book which concern her relationship with her mother or her heartfelt sympathy for the unfortunates she encounters, show her in a much better light.
The BBC adaptation made no bones about overhauling Esther, keeping her charitable and kind nature, but granting her a sense of humour and a sensible, rather than pathologically self-effacing, attitude to her own virtues and vices.
Fridge Brilliance: Allan Woodcourt is Welsh. In that time and place, this would have made him a member of a persecuted minority. Who better to ignore prejudice and see Esther for who she really is?
Moral Event Horizon: The revelation, late in the novel, that Skimpole was the one who revealed Jo's whereabouts.