The Man with the Umbrella - S1-E3
Continuity mistake: Toward the end of episode 3 when player 119 stabs a guard in the eye and takes his gun, he then shoots a second guard in the left arm and holds him hostage. However, after Player 119 sees his guard-hostage is a very young man and decides to kill himself, we see the Front Man walk up to the scene and in that moment the guard-no-longer-hostage has obviously been shot in the right arm. Noticing this made me realise the jungle gyms on either side of the scene got swapped. It's a mirrored image. (00:47:07 - 00:49:03)
The Man with the Umbrella - S1-E3
Plot hole: With all the cameras and guards watching, there's no way anyone would be able to use a cigarette lighter to help them pass the game.
The Man with the Umbrella - S1-E3
Continuity mistake: The umbrella shape on the wall changes in between scenes from wavy lines at the bottom to straight.
The Man with the Umbrella - S1-E3
Visible crew/equipment: When the second game starts and everyone is climbing up the stairs, two of the players are talking. The camera is in front of them going up the stairs. At one point you can see the shadow of the camera on the wall to the left.