Ambiguous Disorder: Charlie exhibits symptoms of what we'd recognize today as something akin to autism or Asperger's Syndrome. Here he's just referred to as "odd" or "shy," and someone who "doesn't fit in anywhere."
Blind Date: Charlie's sister tries to set him up on one in hopes it will help him come out of his shell. It only works as well as you can expect.
Dastardly Whiplash: The doll girl's suitor resembles this type of villain, complete with cartoonishly evil mannerisms and musical cues.
Did You Think I Can't Feel?: Downplayed. While not said bitterly, Charlie reflects to himself (and the doll girl) how his 'imagined' doll world is real because it's filled with people who have feelings like him.
Earn Your Happy Ending: After being misunderstood a great deal of the episode, Charlie and the doll girl finally have a world all their own.
Establishing Character Moment: In the beginning, Charlie's boss calls him in to tell him why he's being let go, in the process establishing Charlie's introverted personality and inability to socially adapt.
Values Resonance / Vindicated by History: The episode has received a lot more praise in recent years for having a main character with a very accurate portrayal of Asperger's Syndrome. A neurological condition that was virtually unknown when the episode first aired and for it's time, wasn't nearly as accepted as it was today.