Silence My Companion, My Death Destination - S1-E4
Continuity mistake: When Rachel is cradling Iron Man and lamenting not going to her piano lesson, she has a cassette player attached to her hip that wasn't there in previously. Given the state of despair she's in, it's unlikely she would have pulled it from out of her pockets (if it would even fit) just to put it on her hip. (00:16:09)