In real life, James Whale wrote a suicide note before jumping into his pool, reassuring his loved ones that he was not depressed, but only wanted to end his constant physical suffering.
When James Whale and Boone get caught in the rain they shelter under an umbrella. In one shot Whale's right side is completely drenched, in a following shot his right side is much drier.
When Hanna stands up to turn the TV off, she throws her napkin/towel on the small table in front of her. It covers most of the table, and also part of her plate (on the right side of the table). When she has turned the TV off and looks back at James, we see the towel lying neatly on the left side of the table.