The house where the killer lived is the same house use in Charmed , the house of the sister Halliwell
When Lisbon comes into the office and sees Patrick on the computer, Lisbon's phone rings. She picks it up, and without looking, recognizes it's Cho.
The Market where Wayne ate his hot dog is same as Dom Torettos Market in Fast and the furious where Brian had his tuna sandwich without crust.
Red-haired actress: Catherine Dent.