Also - Rachel's work environment. Her boss, Joanna, is bitchy, sneaky, ultimately insecure, and - importantly - considered not good enough for Chandler due to being 'really dull' and 'having mascara goop' in the corner of her eye.
Despite being a powerful, important woman, Joanna is floored by Chandler's failure to call her, and it does not occur to her to call him. The other women agree that guys don't call you when they say they will, and this is the normal way of things: not the guy's fault.
Sophie suggests that Chandler may be intimidated by strong, succesful women, and is told to 'climb out of my ass' by Joanna, who - being female, natch - has an irrational, bitchy dislike of Sophie, but favours Rachel.
Also the bit where Rachel tries to come back to work after having Emma, but I don't have time to deconstruct that now!