Phil on Wire - S3-E3
Other mistake: When Cameron follows Mitchell into the sea, Cameron's shirt is visibly wet even though he is in a very shallow area of water. After cutting back to Cameron, the wet mark on his shirt has gotten bigger and traveled further up his shirt even though there are no significantly large waves that could have caused him to become so wet.
Chosen answer: There was a plain wall at the foot of the stairs in the pilot episode. Thereafter, there is a room, but we have never been shown what's in the room.
MovieFan612 ★