Debra and Dexter drive off the side of the road, into a lake, with a witness but there is no mention of it in the station where Dexter works. The police would have to be involved and it would get to the homicide unit quickly.
As every loyal Dexter fan knows, Dexter is set in Miami; however, when Dexter and Deb are driving to find Dr. Vogel, one of the street signs says "Rimpau" in the characteristic blue and white of Los Angeles street signs. There is not a Rimpau street in Miami and most Miami street signs are green with white letters.
Debra sees that Dr. Vogel's house was broken into and is gone but doesn't call the police, then somehow knows where Dexter is to tell him.