The opening scene shows the murder scene, following Emily's bloody footprints from the kitchen to the bedroom. Later in the film, when the stabbing is depicted, Emily walks toward the bed leaving no footprints, and the camera shows a clear shot of her feet which have no blood on them.
In the final scene where she visits him in the office, she is walking outside in the rain with an umbrella. When she is inside the office, the umbrella is dry.
Dr. Banks would never have been allowed to be an expert witness in a case in which he was the defendant's psychiatrist. This would present a blatant conflict of interest. He could only be a fact witness.
She was tried for murder, so whatever securities crimes she and the other psychiatrist were up to, there would be no double jeopardy issues for that crime.
When prescribed the medication, the doctor described the SSRI as "It helps to stop the brain from telling you you're sad. " - That's not entirely true. SSRI medications help to balance the chemical imbalance in the brain for those with anxiety, depression, bipolar, or any other mental health ailment. It does not only deal in feeling happy or sad. Mental health medication helps to restore the control the patient has over their emotions and reactions to stimuli.
(at around 3 mins) The mic, cameraman and camera are reflected in a car window.