You Gotta Lose This Job - S3-E7
Visible crew/equipment: When 'Hannah' and Lilly walk into Rob Reiner's office, the multiple head studio lights are reflected on Hannah's large black sunglasses.
Woman Seeking Dead Husband - Smokers Okay, No Pets - S1-E4
Visible crew/equipment: When Shawn and Gus gets out of the car at the Mausoleum Parking, you can see the camera man reflected in the mirror inside the car.
Visible crew/equipment: When Claire runs away from Bob after he calls her "Ms. Bennet", you can see Bob's shadow and another person's shadow on the ground. Since no one else was standing next to them, it has to be a crew member, most likely a camera man based on the odd shape of the shadow.
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.
End Of Days - S1-E13
Visible crew/equipment: After Lisa appears to Ianto in the holding area, she disappears, when the camera changes angles you can still see her standing in the corner of the room on the right side of the screen. (00:12:50)
A Mother of a Problem - S3-E18
Visible crew/equipment: After Miles signs the document with Daniel and Wilhelmina, when he tells them, "Au revoir," and leaves, the blue T-mark is visible on the floor under the table. (00:31:30)
Treasure of the Nation - S2-E11
Visible crew/equipment: The microphone is visible at the top of the screen when Guy confronts Marion back at Nottingham castle. (00:29:20)