Some quotes that I found particularly validating:
"....emotionally immature parents expect their children to know and mirror them. They can get highly upset if their children don't act the way they want them to. Their fragile self-esteem rests on things going their way every time."
"When stressed or emotionally aroused, immature people don't experience themselves as being embedded in the ongoing flow of time. They experience moments in time as separate, nonlinear blips, like little lights randomly going on and off, with few linkages in time between one interaction and another. They act inconsistently, as their consciousness hops from one experience to another. This is one reason why they're often indignant when you remind them of their past behavior. For them, the past is gone and has nothing to do with the present. Likewise, if you express caution about something in the future, they're likely to brush you off, since the future isn't here yet."
I especially find the book's information on how children who were brought up in these types of households often fall into the categories of "internalizer" and "externalizer". I can see clearly how in my teen years I was an externalizer and morphed into an internalizer as a young adult. The book speaks about how internalizers end up doing too much emotional work in their relationships because they were trained to do the emotional work of their parents in many cases and felt it was their place to take on all this extra crap.
This book is especially good if you are someone who is self-reflective. If you haven't read this book already, I highly recommend it.