Revealing mistake: When Becky meets Simon in the cube, they hug, then Simon literally stabs Becky in the back. As she falls down to the floor, her black shirt reveals not only some of her chest, but part of a black microphone wire. (01:15:15)
Continuity mistake: When Maguire grabs his suitcase and is about to open it, we can see his left foot stretched out on the floor. When it cuts to a close-up of him opening the suitcase we can see his foot is crouched. (00:06:00)
Visible crew/equipment: When we first see Mrs. Paley coming through a door, reflected on the shiny surface of the door is a boom mic. (00:16:35)
Visible crew/equipment: When we see first Kate open a door, it opens, and she leaves her hand up, then slowly lowers it. Look to the left of the cube-shaped doorway, and you can see in the room behind her, the edge of a stand or table or some equipment, which obviously shouldn't be seen there. (00:07:25)
Continuity mistake: When Simon jumps into the room where Maguire is attempting his suicide it cuts to a shot from above and we see Maguire's foot is hanging over Max's foot. When it cuts Maguire's foot is out of sight. (00:14:00)
Continuity mistake: When they are lowering Maguire, Jerry is holding onto Maguire's jacket behind his shoulder. When it cuts Jerry's hand is in front of Maguire's shoulder. (00:14:15)
Continuity mistake: When they start running from the moving wall Jerry grab Sasha holding her left hand. When it cuts he is holding her right hand. (00:20:05)
Revealing mistake: When Kate decides to ditch Maguire and escape herself, we get a shot from above showing her face and Maguire's feet. However we only see his trousers. His feet are gone. Even though some could say that the wall removed them, but we can also see that the wall hasn't reached the part of the feet that are missing. It appears the CGI team forgot to add his feet in. (00:21:35)
Visible crew/equipment: When Maguire raises his hands together to say the prayer, you can see the black wire of a microphone, running up into his shirt. (00:06:50)
Continuity mistake: When Kate opens the door to the room Sasha is in, we see her from behind pushing her hand to the door. When it cuts as the door open she suddenly has her hands placed on both sides of the door opening. She could not have moved her hands that fast. (00:10:40)
Continuity mistake: Kate writes the numbers on her left arm, with the pen she got from the doctor. In one shot though, the writing is on her right arm. (00:39:05 - 00:46:45)
Continuity mistake: In one scene Jerry draws a cube with his watch. There's then another shot, then in the next shot of Jerry, the cube drawn is totally different from what he drew a minute ago. (00:26:15)
Revealing mistake: When Becky climbs through the door and falls upwards a lump appears on her back revealing where the wires are attached as they pull her up. (00:02:40)
Visible crew/equipment: When we first see Kate, she opens a door, and then, she climbs through. As she climbs through, you can see down her blouse, and you can see a microphone. (00:07:30)
Continuity mistake: When Kate is climbing up the ladder to see where Max keeps disappearing to, the left half of her outer tee-shirt alternates from tucked into her trousers, to hanging out. (00:09:55)
Continuity mistake: During the movie, Max's shoes change, and they obviously can't because he's trapped in the hypercube. When helping the colonel who's hanging himself, you can see Max's shoes are black, but then later on they're blue. This is most noticeable in the scene when Max and Julia are talking, and Max throws his shoe across the room. (00:13:45 - 01:08:10)
Continuity mistake: After everyone releases the colonel from his belt and lay him on the floor, Simon takes out his identification. Between a wide shot to a closeup, the top of the colonel's shirt goes from being tucked under his tie, to being untucked from under it. (00:14:30)
Continuity mistake: When Simon first takes Kate down, he covers her mouth with his hand, then with the other hand, holds a knife. In one shot he holds the knife to the side of her face, but in the next closeup shot, he has the knife resting on his other hand, which is covering her mouth. Then in the next shot he is holding the knife to the side of her face again. (00:08:10)
Revealing mistake: When Kate is in one cube room on her own, looking around, just after losing Simon and just before meeting Sasha, as the camera pans around the room, on most of the black cube doors, clearly reflected on the shiny surface of them, are camera / stage lights. (00:10:15)
Continuity mistake: When Colonel Maguire lies down on the floor he prays and folds his hands. When it cuts to a wideshot you can see that he isn't folding his hands anymore. (00:07:05)
Answer: They sent the agent in to retrieve some sensitive information from the blind girl. The girl hid inside the hypercube as she knew they wouldn't come after her and by the time they figured out where she was it was too late to stop her and so they sent the agent in. They shot their own agent as the information she has is that sensitive that they can't let anyone know anything about it (even the fact that it exists).
Sanguis