Continuity mistake: Meadow takes the carton of milk out of the fridge and leaves it on the counter. Tony gets up and opens the fridge and the carton of milk is back inside. (00:11:01 - 00:11:53)
Continuity mistake: Towards the end of the episode Carmella is reading a book on real estate. When a close up of the book is shown, she is at the beginning of chapter 1, yet when the camera angle changes she is about halfway through the book.
The Strong, Silent Type - S4-E10
Continuity mistake: Tony gives Corrado a glass of wine, holding it from the sides. A frame later his hand is on top of the glass.
Continuity mistake: When Artie visits Tony, he runs to the bathroom. Later in the scene, Artie and Carmela help Tony up to go to the bathroom, but Artie says, "Where're we headed?" as though he didn't know where the bathroom was.
Continuity mistake: Ralph's left ear is pierced. The prop of his cut head is not.
Christopher - S4-E3
Continuity mistake: When Gabriella confronts Father Phil about the public speaker, the cannoli that Father Phil has in front of him changes halfway through the scene.
For All Debts Public and Private - S4-E1
Continuity mistake: When Chris places the twenty dollar bill on the fridge, there's a picture of a fat kid next to it. Depending on the angle, a paper covers/not part of the photo.

Continuity mistake: When Christopher is trying to get rid of the body into the bin, his arms are constantly changing between crossed and hanging at his side. (00:30:30)

Continuity mistake: Tony gets out of the car near the start and there is no glass on the floor, when he calls Christopher over, broken glass on the ground has appeared.
Continuity mistake: When Tony speaks to Artie at his home, Artie is seen putting a cigarette in his mouth. However, in the next shot the cigarette has disappeared and Artie is drinking from his cup instead. (00:18:35)
Continuity mistake: Christopher is trying to start a fire with sticks and has a cigarette in his mouth. He starts to go back into the van with the cigarette in his mouth but in the next shot the cigarette is gone and he is rubbing his hands together.
Continuity mistake: While Tony sits with his nephew, the peanut butter jar moves closer to the remote control between the first and second shot.
For All Debts Public and Private - S4-E1
Continuity mistake: When Tony Jr. reads the newspaper, his part of the table changes completely: The napkin changes position, the orange juice comes closer to his arm, the spoon in the bowl changes positions, and a mug in front is replaced for a load of papers. The position of his thumb also swaps from being beneath a photo, to on top of it depending on the angle.
University - S3-E6
Continuity mistake: When AJ is having breakfast, the syrup bottle moves around by itself between shots.
Continuity mistake: The table with the beer bottle by the pool gets closer to the chair after Tony sits down.
University - S3-E6
Continuity mistake: Tracey is cuddling Ralphie at home and places her hand on his belly. The left and right angles of her movement do not match: When she brings her hand towards herself, the following angle shows it on the opposite side.