In the opening scene, the milk carton and bananas appear on the counter without Jerry removing them from the grocery bag.
The surgeon is performing far too low on the patient's body to be removing his spleen, which is located in the upper left quadrant.
While George is watching Home Alone the music heard on the TV is't the soundtrack to the actual film.
In the opening scene, Jerry is emptying his grocery bag and bumps a milk carton which he just purchased. It rocks back and forth indicating it is empty.
Jerry (Jerry Seinfeld) says that the mint bounced off a "respirator thing" and into the patient but when it shows the patient, it's obvious that he's not on a respirator.