Continuity mistake: When Natalie first meets Kevin, the strap of her black dress goes from up, to down, then up again. (00:20:40)
Revealing mistake: In the flood scene, you can see six inch boards on all the doorways keeping the water from spilling into adjacent rooms. (00:28:23)
Continuity mistake: In the flood scene when Natalie walks in and begins to scream, Kevin is standing on the first step of the stairs with his shirt uneven, and the strings for his pants are showing. In the next shot, Kevins clothes are neatly ironed, his shirt is even, and the strings have disappeared. (00:28:30)
Answer: Molly is wearing all gray suits and gray shoes.