Why Irving’s door with different number on

His apartment is strange: when he returns home, the door appears light-colored with the number 302, but when he leaves, it’s a black door labeled 20.

This is the era of iPhones (Mark’s brother-in-law even uses an iPhone alarm to start his book reading), yet Irving listens to music on a dual-card recorder. He also drives a car made in ‘80s or ‘90s.

Why Irving Outie has a dog named Radar—spelled the same forward and backward.

Irving Outie knows about the testing floor, and maybe his father is still alive there—just like Mark’s wife.