Dr. Spear (John Stalker) places a cassette tape in a recorder. The tape is marked "Mike Opana" in neat light gray lettering that fits within a small rectangular label on the side of the cassette. Moments later when the killer removes the tape from the recorder, however, the name "Mike Opana" is written in much larger letters in black marker ink covering much more of the side of the cassette.
Mike watches Danny meet Glynis at the airport. He's viewing them from above through binoculars, but the camera shot is clearly at ground level.
Chin calls Steve from Dr. Spear's office and is told to contact Dr. Chow. Rather than call him immediately on the same telephone, Chin walks to a street kiosk and telephones from there.