Overcooked potatoes (Possible Spoilers)
Although this event occurred during Day II, I took this to be one of the first major chinks in the armor of her routine, leading to her ultimate unravelling on Day III. She seemed to be at a loss of what to do with them, wandering aimlessly from room to room with the pot still in her hand before finally tossing them out (or just one of her many OCD tendencies?--seriously, that meatloaf scene for chrissakes!).
Any other thoughts on this sequence, or was I reading too much into it?
Regardless, this has to be one of the most unconventionally absorbing and riveting films I've seen; I couldn't take my eyes away from the screen for a moment--not even to push pause and use the bathroom.