Corrected entry: The math sucks in a number of cases throughout the film. Worth (the designer of the cube) says the dimensions of the cube are 434 square feet (possibly meaning one side of the cube). That makes about 21 feet a side. So there would be exactly one room inside the cube since Leaven measures the room to be 14 feet wide. Still she figures out that there are 26x26x26 rooms. Also when Kazan is calculating the number of factors he tells a wrong answer more frequently than a right one. There are even even numbers he says are prime.
Corrected entry: With 17,576 rooms, it's nearly impossible to enter the same room twice while moving through the cube. Yet they find Rennes corpse, and end up in the room they started in. They were very lucky, or they knew where they were going.
Corrected entry: After you enter a new room, the chamber doors automatically spin their handles and close shut. There is a scene near the end where the cop closes a chamber door himself while another character is talking. The director admits in the commentary that this is because that particular shot was done earlier in the filming before he decided they would close automatically.
Corrected entry: All the characters seem to have a purpose (math, leadership, escape artist, etc.) except for the character, Alderson(?), who dies in the very beginning. Why would those who run the cube bother to put someone who has either no skill or one we never came to know in a room where they would die immediately? The other characters seemed to have gotten a fair chance in that they didn't wake up in a booby trapped room. I don't believe even the cat burglar would have survived if he woke up in the same circumstances.
Corrected entry: The blonde doctor said that 'they' took away all her jewellery; her bracelet and all her rings. But when she hangs outside the cube with the rope-of-clothes, she grabs the hand of the black policeman and we can clearly see a ring on her hand.
Corrected entry: About 33 minutes in Worth and Quentin have argument and Worth ends up screaming out "There is no way out of here". This leads to the revelation that he designed the shell around the cubes. Then when Leaven questions him he tells them about the door. Which means there is a way out that he knows of. So why did he scream that there wasn't?
Corrected entry: The Dice & Slice trap, which killed Alderson in the very beginning, would not work in reality. The grating has a rod below. Instead of dicing/slicing the victim, the grating's rod would bounce off his legs or feet.
Corrected entry: Leaven says factorizing numbers to see if they're powers of a prime would be astronomical. Someone at the V.O.X. (CUBE message board of the official site) rightly mentioned that there are only 24 powers of a prime between 1 and 999, which are not prime numbers. Leaven is able to identify the latter and it would have been no real problem for the group to calculate the other 24 and remember them. It is not astronomical.