Phone call theories and observations from a recent...

Phone call theories and observations from a recent trip:

The Porter calls Malcolm from the hotel lobby. Malcolm answers at the detective agency. He says something about a sister. The Porter tells him of a falcon that was hawk’d last Tuesday.
A few minutes later, the Porter calls Agnes. She happens to be in the detective agency and picks up. She says, “How did you know I was here?” The Porter tells her to come to the McKittrick Hotel.
Later on, when she returns to the hotel lobby for the 2nd time in her loop, the Porter plays a trick on her. He dials a number from the counter and walks away. The phone in the booth across the room starts ringing. This scene is sometimes different dependent upon who is playing Agnes that night.

Behind a White Mask