There are 2 different bathtub scenes! The first one I believe that is Williams hand and not Juliet.
The scene with Juliet - the water is tinged with blood- you can see the pinkish tinged water going over the side and the water in the tub is darker. The exterior of the tub is also different, it has a marbleized finish.
The other tub is plain.....like a hotel tub....like maybe would belong in a room down that hallway we saw William walking down.
(I don't know how to link this)