Could someone clear up a few things?

I watched the movie, which kept my interest and at the edge of my seat. However, I do have some questions.

1. During the movie the guy (Sorry, I forgot his name and I don't want to use the back button to check it out in case my post is deleted.) who was being held captive was unable to see what was going on in the room in which Clive was carrying in water. He even asked Monty, the dog, to see what was going on. Yet, later, the captive was able to get rid of the water in the tub, which was in the room he couldn't get into. How did he do that?

2. What was the captive training Morty to do? If he was training him to let the water out of the tub in the other room, how did the captive know that water was being put into the tub if he couldn't see into the room? (Remember, there were two rooms. The captive asked Clive why there were two rooms when he already had one in which to wash up.)

Any help would be appreciated!