Visible crew/equipment: When Bill runs beside Boco, you can see a camera moving out of the shot. (Visible in HD full screen version).
Visible crew/equipment: When the porter bangs the door, a light-stand is briefly reflected on the window of the door.
Visible crew/equipment: When Henry is ill, one of the lights behind Henry is not one of the ones from outside, it's a studio light.
Answer: Breakdown trains help the engines back on track.