Every time dead people are close by, there is something red in the preceding scene (i.e., when Cole is at the birthday party and is about to get trapped in the attic with the ghosts, there is a red balloon rising toward the ceiling; when Graham comes home to his wife sleeping and is about to realize that he too is dead, she is wearing a red throw; when Cole is in the car with his mother and there is an accident up ahead, she is wearing a red sweater, etc).

Watch carefully as Dr. Malcolm walks away from his wife's jewelry shop - his jacket is open, and he keeps his left hand over his lower left-hand-side stomach...

The doctor that treats Cole after the incident at the birthday party is played by director M. Night Shamalyan. Interesting about this scene is that Shamalyan came from a family of doctors, including his wife who is one. He also at one time wanted to become a doctor before he decided on a career in filmmaking.