The position of the file folders and documents Goren used to partially obstruct the yearbook when Charlotte Fielding came in to talk to him and Eames.
Mrs. Rankin does not appear to dial the house phone when contacting the children's school. She simply picks the phone up puts it to her ear and begins to talk after a very brief pause.
As Charlotte Fielding is walking up to the detective's office, there is briefly a boom mic visible at the top of the screen.