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.
Hilarious in Hindsight: At one point, Margo quotes from Julius Caesar ("the evil that men do", though she can't remember what comes after that). Three years later, Joseph L. Mankiewicz went on to direct an adaptation of Julius Caesar.
Nightmare Fuel: The concept of someone slowly destabilizing your life and your nearest and dearest friends not believing you when you turn to them for help makes Margo's frequent angry outbursts very understandable.
Unfortunate Implications: It has been argued that this movie has anti-homosexual and anti-feminist undertones. Addison and Eve are presented as villains, and, as noted, are often interpreted as homosexuals. Eve's focus on her career, in contrast to Karen's devotion to her husband, and Margo's eventual acceptance of Bill and of her fading career, is shown as devious, and she eventually succumbs to Addison's domination.
Then again, there are no "evil" characters. Just a Dog Eat Dog theatre world where everyone is guilty of something. According to the Word of God, the film is about the fact that actress careers are basically over by middle-age, and there's hundreds of young actresses willing to take their place (as evidenced by the shot of hundreds of Phoebes in the mirrors.)