In the scene where Tony comes home late to Carmela's supper, his plate is shown in at least three different orientations between shots (greens on his right, greens on his left, and greens at an angle).
In the original airing, Mike Nichols was incorrectly credited as playing Dr. Krakower in this episode, when the role was actually played by Sully Boyar. Nichols was originally set to play the role, but had to back out.
Big Pussy, as far as his wife knows, is in the witness protection program (WITSEC). Although usually the case, a person can enter the program without taking any, or all, of their family members in with them, so she would not have had to have gone with him and she could have easily been left behind. That fact is what makes Big Pussy's entrance into the program and subsequently Tony's lie to Big Pussy's wife so bad - that he would choose to leave her behind on purpose upon entering WITSEC.
The clock in Junior's kitchen is stuck at 12:55. The second hand does not move.
In a scene which is supposed to take place at two in the morning, he Sun's rays can be seen coming in from the window.
At the beginning of the doctors meeting, in first shot there is a visible stain on the left side of the camera.
Tony brings Junior a milkshake that he says is from 31 Flavors (Baskin-Robbins). However, the cup he's holding is clearly from Dunkin' Donuts.