Continuity mistake: The patient Zoe is in the ER with her boyfriend while Doug, Carol and Lydia work around her. At one point she puts her hand up to her throat, but in the next shot it's down by her hip, without enough time for the change.
Freak Show - S4-E8
Continuity mistake: Peter, Elizabeth, and Romano are with the little boy who has organ reversal and as Romano says "genetic breakthroughs are in the wings", Peter puts on one glove. As Lizzie asks him if something is wrong, he is putting on the glove again. As they continue to talk, he begins to examine Rodney, but when the shot changes, he is still putting on his gloves.
Of Past Regret and Future Fear - S4-E20
Continuity mistake: After Anna tells Tina Marie she might have kidney problems, Tina grabs her husband Emmett's hand and then puts her other hand over it; the next shot shows her hand is still on the tray and then she moves it to cover Emmett's again.
Continuity mistake: When Carter comes into the ER with breakfast for everyone, he slips on the muddy floor and the food goes flying. A cardboard tray flies straight up from his left hand but ends up a few feet to his right, which defies the laws of physics.
Continuity mistake: When Mrs. Novotny offers to get aspirin, Angie helps her up by Mrs. N.'s left hand - there's no blood on it, but the next shot shows her hand quite covered in dried blood. Mrs. N. has no blood on her clothes, despite being right next to her husband while he bled to death and Carol administered CPR.
Ground Zero - S4-E6
Continuity mistake: Carter is talking to Carol about his grandmother. The shot is mainly on her but we can see him put his pen away and pick up a chart - then the shot goes to him and we see him do the same thing again.
Continuity mistake: When the man who was hit by a driver while on his bike, was being taken to the trauma room he is bumped by someone and blood starts spurting everywhere, including on Maggie, who is wearing Abby's coat. In the very next frame, the coat is clean with no blood on it at all, with no time for Maggie to have changed the coat.
Continuity mistake: Early in this episode when Dr. Kovac is shaving in the bathroom, the shaving foam on his skin is changing during shots, most noticeably in the region of his ear. (00:02:30)
Continuity mistake: Peter and Dr. Romano are in the operating room arguing about Romano's lack of sobriety. Over the course of less than a minute, the clock on the wall goes from 8:15 to 5:15.
Continuity mistake: When Kerry is talking to Doug about his fellowship proposal, his stethoscope moves a couple of inches higher on his neck, even though he never touches it.
Continuity mistake: Carol is working on James' injury and Duncan goes to answer the phone. James has his arm wrapped around the phone but the shot changes to focus on Robert - we can still see James but his arm is now at his waist, even though he had no time to change positions.
Continuity mistake: While Carol is trying to save Mr. Novotny's life, Mrs. Novotny's hair alternates from being loose and hanging over her cheeks to being neatly tucked back into her bun. In fact, a few minutes later when Carol asks for her keys, her hair looks just-brushed shiny and newly coiffed - it's unlikely she would have fussed over her hair at this stressful time.
The Letter - S8-E20
Continuity mistake: When Carter and Abby are kind of fighting outside, when Carter is carrying Abby back to the car,from the front shot he threw her over his left shoulder, but a second later, from the rear view when he drops her she is on his right shoulder.
Continuity mistake: When Carter picks up his crutches from the floor of the lounge, his hand is near the crossbars. When he hoists himself up, the shot shows his hand near the top of the crutches.
Good Luck, Ruth Johnson - S5-E9
Continuity mistake: Carol is in Wilson's room writing on the center of his chart. When the shot shows her turn to answer Wilson, her pen is writing near the edge of the chart. She didn't have time to change the pen's position so quickly.
Obstruction of Justice - S4-E9
Continuity mistake: Near the start of the show, Carter gets a can of soft drink from the machine and just then his cousin Chase shows up in the ER - they hug and somehow the can, which should be in Carter's hand, has disappeared.
Continuity mistake: When Peter signs the consent form for his surgery, his head is raised off his pillow a few inches. The shot changes and he continues to sign - but now his head is lying on the pillow even though he didn't have time to move.
Continuity mistake: In this episode Susan is thinking about giving little Susie up for adoption, throughout the episode the baby playing little Susie switches from a brown eyed baby to a blue eyed baby.
Continuity mistake: Near the beginning of the show, when Elizabeth and her mother are having tea before they both go off to work, for a couple of shots from in front of her, Elizabeth is holding the mug with both hands, but the shots from behind her show her holding it with one hand only.
Greene with Envy (a.k.a. Lawrence of Northwestern) - S6-E3
Continuity mistake: When Dr. Lawrence is working on the ER with Mark, he gets frustrated because the tag Kerry's issued to everyone gets in his way. He asks someone to get it out of his way, and as he moves around to the other side of the table, we can see it has been pulled up around the back of his neck. As he reaches the other side, it is suddenly hanging straight down again. A short time later it is tucked up around his neck again. At no time did he adjust it.
Answer: Take care of your dad.