Visible crew/equipment: When they are at the crime scene, you can plainly see the camera and camera man reflected in Special Agent Lundy's sunglasses several times. When it is a close up shot, it is even more obvious.
See-Through - S2-E4
Visible crew/equipment: When the wife of one of the victims invites Angel in, the silhouette of a camera man is reflected in the door when she closes it.
See-Through - S2-E4
Visible crew/equipment: As the camera pans to Dexter just before he jumps over the fence at the police station, the shadow of a boom mike is visible on the white wall.
Dirty Harry - S4-E5
Visible crew/equipment: After the ambulance taking Deb to the hospital drives away, a crew member ducks down in front of a parked car in the background. (00:04:36)
Seeing Red - S1-E10
Visible crew/equipment: When Dexter is walking towards the entrance of the Marina View Hotel to examine the crime scene, a boom mic is visible in the glass of the window on the right. (00:07:35)
Hungry Man - S4-E9
Visible crew/equipment: When Dexter rings Arthur Mitchell's doorbell Sally opens the door, and in the next shot facing Dexter, the reflections of equipment and crew, such as one crew member standing on a ladder (appears orange), are visible on the door's glass at the left side of the screen. (00:18:35)
Visible crew/equipment: When Dexter is searching the empty house, you can see a crew member with his sunglasses on outside the window. (00:45:49)
Shrink Wrap - S1-E8
Visible crew/equipment: When Dexter is picking up the fruit dropped by the man carrying groceries, the cameraman is reflected on the side of the car. (00:17:30)
The Lion Sleeps Tonight - S3-E3
Visible crew/equipment: While at the cemetery a reflector (to brighten the actors' faces) is regularly visible in the DA's glasses.
Answer: No, Harry is not the real father. While he did have an affair with Dexter's biological mother (Laura Moser), this was when she was his C.I. Dexter was already born at that point.