Owner of a Lonely Heart - S2-E11
Continuity mistake: Olivia walks into an elevator with Izzy already inside and they go up 3 floors. When Izzy leaves the elevator, it's the same floor from which Olivia came (same equipment and decor).
(As We Know It) (Part II) - S2-E18
Continuity mistake: The scene where the bomb explodes shows the bomb squad captain walking toward the end of a hallway. Just as the bomb explodes you can see he is about 5-6 feet away from the end of the hallway where another bomb squad tech is waiting. After the explosion the scene cuts to Meredith flying backwards then to a shot of windows being blown out then back to a rear shot of Meredith hitting the floor. Notice here that a second floor is not visible at the end of the hallway. The scene finishes with a final aftermath shot of the hallway as the debris settles. Here we see an entirely different hallway with a visible second floor and the end of the hallway extended by about 10 feet.
The First Cut Is the Deepest - S1-E2
Continuity mistake: When Meredith is walking over to the beds, the cooler and packet of crisps that she is holding swap hands between shots. (00:24:35)
Factual error: At the end they land at Sioux Falls Airport or "Joe Foss Field" but the shuttle says "Joe Boss Field".
Continuity mistake: When Derek comes out of surgery he removes his hat. In the next shot it's back on. (00:40:05)
Visible crew/equipment: When Meredith is asking Dr. Bailey for Derek, a cameraman is reflected in the glass panels beside them. (00:10:50)
Winning a Battle, Losing the War - S1-E3
Continuity mistake: When Christina is talking to Shelley about her husbands organs, the clipboards on the table in front of her keep changing their positions. (00:28:25)
The First Cut Is the Deepest - S1-E2
Continuity mistake: After George finishes brushing his teeth, he has a smear of toothpaste left on his cheek which disappears between shots. (00:34:10)
Continuity mistake: When the interns are sitting on the beds, Izzie stretches her arms upwards twice between shots, when talking about geriatrics. (00:15:50)
Continuity mistake: When George is telling Gloria that her husband died, the woman standing next to Gloria puts her hand on her shoulder three times. (00:33:20)
Continuity mistake: Dr. Bailey points out four pagers for the four interns. However somehow there are two pagers left over. (00:04:30)
Continuity mistake: Christina turns her head away twice, when Meredith is picked for surgery with Derek. (00:29:55)
Winning a Battle, Losing the War - S1-E3
Continuity mistake: When the interns are asked who wants to assist Burke, everyone raises their hands. When they lower them, Christina lowers her arm twice. (00:03:10)
Continuity mistake: When Dr. Miranda Bailey tries to resuscitate/reanimate her patient Jeremiah, the assistant puts the anesthesia bag down next to Jeremiah's shoulder, in the next shot however, she has the bag back in her hands and lies it down once more.
Continuity mistake: When Meredith's talking to Lexie in the clinic, in one shot from Lexie's right there's a chunk of hair hanging in front of her ear. We cut to a shot from the other side, then back, and without her touching it, it's now neatly tucked back.
Continuity mistake: Just before Meredith answers the question about the "common causes of post-op fever", her file opens itself between shots. (00:36:00)
The Lion Sleeps Tonight - S8-E18
Other mistake: At the beginning of the episode, when Meredith, Derek and Zola see the lion crossing the street in front of the car, the lion roars and it is clear that the lion is not missing any teeth. However, later in the episode, Richard removes a tooth that had gotten lodged in the male mauling victim's arm. The victim was the lion's owner and the attack happened in his house, so by the time the lion was out the tooth should already be missing.
Continuity mistake: Cristina walks in during the party with two containers of cupcakes, places them on the side table and walks out. When Alex opens the lid and starts picking at the cupcake toppings, in the shots facing him the top container lid is wide open, but in shots facing Meredith the lid is closed and the cupcakes are untouched. (00:40:20)
Something to Talk About - S2-E7
Continuity mistake: When Nurse Debbie gives Christina all the patient files, the 'explosive diarrhoea' file that she puts at the very top of the pile disappears in the next shot and then reappears in the next shot, but turned the other way round. (00:14:40)
Continuity mistake: When Derek sits in the rocking chair in the room with the premature baby and then Addison starts listing their relationship options, the blanket hanging over the back of the rocking chair constantly changes position, evident by the green stripes on it. (00:31:50)