Visible crew/equipment: When Burke steps onto the elevator Miranda declines his offer to scrub in on the GSW, and just as Miranda admits to having a "date" that evening, a T-mark can be seen on the floor in front of Burke. (00:10:40)
Owner of a Lonely Heart - S2-E11
Visible crew/equipment: In the NICU, when George starts boasting that he has the best quint, in the overhead wideshot we can see the T-mark (greenish yellow) on the floor near Kate, moments before Karev walks in and stands there. It's visible again just as Karev walks away. (00:01:05)
Owner of a Lonely Heart - S2-E11
Visible crew/equipment: When Burke hands Cristina the cup of coffee as she leaves for the hospital, blue screens can be seen in his eyeglasses.
Grandma Got Run Over By A Reindeer - S2-E12
Visible crew/equipment: When Burke and Cristina are walking along and Burke asks her if there is anything he should know about her religious holidays, you can see crewmembers, a boom and a stage light reflected in the glass running alongside. (00:05:30)
Visible crew/equipment: After Meredith discovers Derek visiting her mother at the nursing home, when it cuts to Miranda in the OR the T-mark can be seen on the floor at Cristina's feet. (00:26:40)
(As We Know It) (Part II) - S2-E18
Visible crew/equipment: When Meredith is walking away from Thatcher's house, there is a crew member that is between the house and mailbox who slips into the shadows. (00:33:12)
Damage Case - S2-E25
Visible crew/equipment: When Izzie closes the door with blinds hanging on it, before going to sit on Denny's bedside, you can see a crewmember with their filming equipment reflected in the glass of the picture hanging behind her. (00:35:00)
17 Seconds - S2-E26
Visible crew/equipment: After Burke and Alex board the helicopter to get the heart transplant, in the shot of Cristina backing away from it, you can see a red-capped crewmember and the camera reflected in the chopper's window. (00:06:25)