* LesYay: A strong belief for Rebecca's obsession over Sarah is that she's a PsychoLesbian. If she's not this, then she's a very jealous and clingy "friend".
* MoralEventHorizon: That bit with [[spoiler:the kitten in the dryer.]] Doubles as a {{Tearjerker}}.
* ParanoiaFuel: The idea that your roommate could be a mentally unstable person who may be become just a little too attached to you could be enough to make you want to live by yourself for a while.
* UnfortunateImplications: The suggestion that Rebecca did everything because she was bipolar is a slap in the face to the majority of bipolar people. Also, since Sarah didn't know about Rebecca's misdeeds until she found her medication, her fears were initially based only on her fear of Rebecca's mental illness.