I'm surprised no one has caught this one....
"She wouldn't hurt a fly." The famous line to the ending of Alfred Hitcock's Psycho. The Hotel is also called Marsh House. The film Psycho visually ends on a marsh when Marion's car is being recovered.
Also, "What's in the bag?" seems to be a reference to the film Se7en. While probably coincidental, both wives's names start with T, Tess and Tracy respectively.