Cube (1997)

Plot hole: Kazam is supposed to be a math genius, something that the plot hinges on, but he makes several mistakes when calculating the number of prime factors to find out whether a room is trapped or not. He says that 462 has three prime factors, when it has four, that 206 has four when it only has two and that 563 has two and 911 has three when both are actually prime numbers.

Quentin: Start with us. We got an escape artist and a cop. There's gotta be a reason for that. You're a doctor, Holloway. That gives you a function, a reason, right?
Holloway: No! It just makes me go, "Why me and not one of the other ten million doctors out there?"

Trivia: All the characters in the movie are named after famous prisons around the world - Holloway, Wren, Leavenworth, San Quentin, etc. The characters match the prison types too - Alderson never meets the group, and isolation is the major form of punishment at Alderson Prison in West Virginia. Dr. Holloway is a female doctor, and Holloway Prison is a women's prison in England, Kazan is autistic, and Kazan Prison is Russia is a "disorganized" prison, etc.

Question: Why/what was Kazan so afraid of, after he fell into the green cube, from the blue one (on top), the one Quentin opened? I remember Kazan saying he didn't like the red ones, but they were in a green one I think. Also, how did he survive in there, is he a survivor of a previous rounds, or how did he know the spike room for example? (00:23:25 - 00:42:35)