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- Taking a page from HITCHCOCK's PSYCHO play book, CASTLE lets his victim intrude on a shower with a killer already in it
- The cougar shows her claws: Amy's front yard confrontation of Libby
- The ominous fog that envelops the Mannering home in the finale
- Early use of the hider-in-the-hatch phenomenon (Remember kids: Always check the backseat of your car for the killer!)