In the pool scene where Sebastian and Annette are in the pool together, watch when Annette starts to walk towards Sebastian. If you look closely at the bottom of the pool, there's an "X" right where Annette stops walking. You'd think it was one of those "X"'s the swimmers use, but the pool doesn't have any of those!
If you watch the movie with the director's commentary on they actually
tell you that they forgot to conceal that. It was Reese's marker so she
knew where to stand for the camera angle. And also, notice Ryan's
shivering in the scene due to the lack of heat in the pool.
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