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.

Revealing: 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.

Audio problem: When Simon opens the portal to discover Jerry walking upside down, Jerry is saying things like "Do you need a hand there? You're upside down", yet his mouth doesn't move at all.

Continuity: 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.

Continuity: When they start running from the moving wall Jerry grab Sasha holding her left hand. When it cuts he is holding her right hand.

Visible crew/equipment: When Mrs. Paley opens one of the portals, she sees herself getting killed by Simon, then Simon getting his head taken off by something. Then the portal door closes, and a camera and crewman are reflected in the portals shiny surface.

Continuity: When Jerry marks the door with "5" he place his palm flat on the wall. When it cuts, his fingers are bent.

Continuity: When they are lowering Colonel Maguire down after his suicide attempt, Max is looking down to his left. When it cuts he is looking down to his right.

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.

Continuity: At the end of the movie when Kate is killed from behind, the number and positioning of soldiers in front of her is completely different in the shots immediately before and after Kate's death.

Continuity: 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.

Visible crew/equipment: When Sasha says "I wish I had your spirit" to Kate when Kate is climbing up to open a door, you can see the reflection of the boom mike moving as Kate is climbing.

Continuity: 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.

Continuity: When Kate walks over to the silver frame and says "It's Jerry's diagram," all the numbers which were previously written, appear on the frame. However the "9", which should be on the bottom of the frame behind her, is missing.

Continuity: When Simon meets up with the "second" Jerry he throws him to the floor making Jerry almost falling through the door. Then Simon grabs Jerry with his left arm, but when it cuts he is holding onto Jerry with his right arm.

Continuity: 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.

Revealing: 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.

Continuity: The properties of the writing on Kate's arm changes throughout the film. The "60659" changes in various scenes. Sometimes the handwriting differs, or the darkness of the writing changes to being fainter, or vice versa.

Continuity: The position of the ‘rope’ of clothes on which Simon is holding changes. In one shot he is holding onto a particular part of a shirt, but in the next he’s holding onto a different part.

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.