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.
Was Christina actually abused? Or was she just a bitter young woman trying to make money off her dead mother? Some in Hollywood think that the answer is somewhere in the middle. On one hand, Joan was widely known for having a temper that the public rarely saw due to her being self-aware of how it would hurt her career. On the other hand, Joan cutting her daughter out of her will pushed her over the edge towards writing the book and amplifying the severity of the abuse to epic levels.
Several of Joan Crawford's friends, such as Myrna Loy, and biographers, such as Donald Spoto and Charlotte Chandler, have argued that Joan's strictness toward her children was grossly overblown by Christina, who had real discipline issues throughout her childhood and adolescence and a poor relationship with her mother thereafter (as did her brother Christopher; the twins had a much better relationship with Joan), and who wrote the book as a Take That out of resentment, justified or not. (The sources who argue in favor of this interpretation often acknowledge that Joan had personality issues that made her not particularly well-suited to be a mother, despite her intense desire for children.) Other friends of Joan Crawford and Christina including Helen Hayes, June Allyson, Rex Reed, James Mc Arthur, Betty Hutton, Eve Arden and Lana Turners daughter Cheryl Crane have come forward to say they did witness some abuse.
Joan also counts: Was she an abusive bitch? Or was Joan just mentally disturbed/in desperate need of anti-psychotic medication?
John Waters opines that, besides being a prime candidate for medication for her various mental disorders, Joan suffered greatly from the sudden rise from poverty to super-stardom, causing her to project all of her issues with being poor into her obsessive cleaning and going postal on Christina when she used poor people clothing hangers or got into Joan's ultra-expensive make-up.
The camp that argues that Christina's account was either greatly exaggerated or outright fabricated admits that Joan did place an overemphasis on discipline with Christina and Christopher, though she corrected this when raising the twins, and agree that she had issues with having grown up poor and in a dysfunctional family environment.
Considering Joan really did strap Christopher down to his bed to prevent him from masturbating indicates, yeah, she really was abusive.
Took The Bad Film Seriously: Faye Dunaway genuinely believed she would win an Oscar for her portrayal of Crawford. She later said that she was horrified and ashamed of the end result, often saying that the director just didn't care to tone down her performance.
John Waters did this with his DVD commentary. He opens his DVD commentary effectively telling listeners that he's going to approach the film as the serious bio-film that it was supposed to be. He also condemns the attempt to turn it into a cult classic by the studio by way of retooled marketing, pointing out how forced it was to try and do it without letting it naturally occur.