To See the Invisible Man - S1-E40
Continuity mistake: In the cafeteria, the "invisibility" mark on Mitchell's forehead has moved to a higher spot than it occupied in previous scenes. (00:05:00)
To See the Invisible Man - S1-E40
Visible crew/equipment: When the woman ignores Mitchell and rushes into her apartment building, the glass door she opens reflects the camera, crew and studio lights. (00:06:20)
Answer: He was in an accident.