Question: What exactly is a Code Red?
Question: What did Candyman mean when he told Helen it was always her? Why was he so interested in Helen?
Answer: When Helen goes back and sees the mural of his murder, the camera lingers on a woman in the picture that looks like her. This is the woman Candyman was in love with before he was killed. The implication is either she was reincarnated as Helen, or Helen reminded him of her, hence his interest in her.
Question: Why did Catherine change her mind about killing Nick at the end? Obviously she was planning on killing him anyway, but she changed her mind only hours after ending their relationship when her book was finished and was of no further use. So why did she spare him? Was it because she fell in "love" with him?
Answer: There's no definitive answer to this and the ending is deliberately ambiguous and open to interpretation. The audience is left to speculate whether or not Catherine kills Nick, or if she intended to kill him but changes her mind because she loves him, or intends to kill him at a much later time, and so on.
Question: At the bank, near the beginning, what was the security guard watching on the TV?
Answer: The film is Touch of Evil (1958), directed by Orson Welles. *SPOILER* Within the specific scene that the guard is watching, Quinlan (played by Welles) is holding a box with dynamite sticks inside, with Vargas (played by Charlton Heston) contending, "I looked in that box, just now, there wasn't anything there" (the box had been empty when Vargas was in the bathroom). This scene in Touch of Evil is foreshadowing the end with Cosmo in Sneakers (1992).
Answer: It's something done to one trooper in a unit who is not pulling his load, to let him know his teammates are tired of him making them look bad. It can range from a beating after lights out to scrubbing a soldier who won't shower with toilet brushes and Comet. (And yes, both of those are from my own military experience, though I wasn't the victim!) It's meant to give a warning and doesn't normally harm anything but the victim's pride. They are strongly against regulations in the past year or two as several soldiers were injured by their unit getting overzealous, just like in the movie.
Grumpy Scot