Alpha Bitch: Once Marcia gains her self-assurance that she indeed has the ability to play a major role in a Shakespearean play, her ego begins to grow ... big time! So much that her siblings are annoyed by her just being in the room because she's going to talk about how great she is. She insults her castmate, an awkward kid whose voice is still cracking (she calls it "squeaking," which upsets "Romeo") ... and she becomes rude to her teachers and others at school.
Arson, Murder, and Jaywalking: At the end of the episode, when the family returns home from the play, Alice comments that, as sad as it was when Romeo died, followed by when Juliet died, the saddest part of all was "when Jan said 'Who goes there?' before Peter said 'hark'".
Broken Tears: When Marcia — after Carol tells her she had lost the role of Juliet — finally realizes what her bad behavior (to put it very nicely) has cost her.
Earn Your Happy Ending: To some extent. The actress playing Lady Capulet had to drop out, due to a bout with mumps. Marcia, having learned a lesson in humility, asked if she could perform the role, promising that she'd be professonal and courteous in the role, and not the diva she was previously. She was approved to return the cast, now in the smaller role of Lady Capulet.
Hostility on the Set: In-universe. Marcia’s behavior at a practice one afternoon: She complains about co-star Harold’s awkwardness and “squeaky” voice and is totally rude to her teachers, who are (nicely) trying to remind her this play is not a Broadway premiere. Unknown to Marcia, Carol shows up at practice (to deliver advertising materials for the program) and witnesses the debacle of a practice. Carol — who learns this is far from the first such incident — and her teachers agree that drastic action is needed.
School Play: Shakespeare's Romeo And Juliet, with Marcia cast (initially) as Juliet. Marcia at one point interprets her role in this as her next big break for Hollywood stardom, instead of considering this is just a junior high play to be enjoyed for the moment and to learn from.
Small Name, Big Ego: Marcia's ego swelling to mammoth proportions, to the point that she thinks she's the greatest diva/actress in the whole wide world and she doesn't have to cooperate with anybody.
