Continuity mistake: When Junior comes downstairs from shaving and enters the kitchen, his face and left ear have some smears of shaving cream. Junior walks into the den in the scene that immediately follows, and the smears of shaving cream have increased under his nose and on his left ear. (00:13:40)
Continuity mistake: When AJ is telling his parents about the party, his sleeves go from being rolled up above his elbows, to being rolled right down and back again between shots.
Continuity mistake: In all of the episodes where Carmela hosts her film club, the theater seats in the Sopranos' screening room are gold, attached with wide trays for snacks, beverages, etc. But in this episode, when Tony and A.J. move the seats outside, they are maroon, without the wide trays.
Continuity mistake: While standing outside the horse's stall, Ralphie's arms go from being at his sides, to folded across his chest throughout the whole scene.
Knight in White Satin Armor - S2-E12
Revealing mistake: Noticeable blood pack under Richie's shirt when he's shot by Janice.
Revealing mistake: The Ukranian woman's body by the stairs keeps changing positions all the time (depending on the angle), despite her being dead.
Continuity mistake: Livia's hair style keeps changing all the time while having her last talk with Tony. In this scene the Livia character has been superimposed from pre-existing footage as the actress Nancy Marchand had passed away.
Continuity mistake: When Tony sits by the pool, the position of the towel on the chair changes through shots.
Irregular Around the Margins - S5-E5
Audio problem: From a front angle, Tony tells Adriana about how good his doctor is. Cut to a side angle and Tony's voice is out of sync with the image. Then back to the previous front angle and the audio syncs perfectly.
The Telltale Moozadell - S3-E9
Continuity mistake: During the scene where Rocco gets water thrown at his face, the position of his hands differs between the close-up and the wide angle.

Continuity mistake: During the show's opening credits for the entire run of the series, when Tony drives up to the NJ Turnpike toll gate, the lane 7 machine spits out a toll ticket, and Tony reaches for it. It then cuts to a close-up as Tony grabs hold of the toll ticket, but this ticket machine is now different; note all the stickers. The close-up was shot at another lane's ticket machine.

Continuity mistake: At dinner, when Meadow gets upset, she leaves the table and heads upstairs, so Carmela leaves the table and follows her daughter. Then, when Livia gets insulted, she tells Junior to take her home, and she too leaves the table. The problem occurs when Tony tells Junior, "You mangia, Uncle Jun', she'll come back," and in the next shot facing Junior, the reflection on the door shows Carmela and Livia are still seated at the table.

Deliberate mistake: While Tony stands beside his car, the first assassin shoots at him, and when Tony dives into the front seat we see the car's dashboard. After struggling with the second assassin, when Tony crashes into the parked car, in the shot from inside the car, there are two issues: the car has a different style dashboard with no air vents, and the rearview mirror is missing; then it reappears.

Visible crew/equipment: During the dinner scene, in some of the shots facing Junior, the reflection of the boom operator (wearing a watch) holding up the boom pole/mic is visible on the glass, toward the top left side of the screen. Additionally, in two shots facing Junior (POV beside Carmela's right shoulder), we can see part of a black reflector screen (collapsible type) between Junior and Carmela.

Continuity mistake: When Janice goes to Livia's mailbox and retrieves the envelope with her disability check, the words "TOTAL DISABILITY" only appear on the check in the close-up, but not in the previous shot. Additionally, the silver screen door is gone between the first wide shot when Janice pulls the mail out of the mailbox, and the next close-up as Janice looks through the mail in her hands (she did not open the screen door between shots).

Guy Walks Into a Psychiatrist's Office - S2-E1
Visible crew/equipment: While Janice and Barbara are talking at the backyard barbecue, when Paulie appears, Janice makes a crack about him not being dead yet. It then cuts to Carmela and Janice walking down the home's outdoor steps, and the reflection of the moving boom mic is visible on the front door's glass, behind Carmela.

Visible crew/equipment: While Sal and AJ are at the batting cage, Matt starts telling AJ about the German philosopher Nietzsche. As the camera moves backwards in this dolly shot, we can see two metal T-marks on the ground, as well as the dolly track at the left side of the screen.

Moe n' Joe - S6-E10
Visible crew/equipment: When Jim's beeper goes off in the middle of the night, Vito decides to go along with him to the emergency. In the first shot on scene, there are two chalk T-marks on the sidewalk, and Vito stands at one of them.

Visible crew/equipment: While Tony and Chris are seated outside Satriale's discussing the hit on Rusty, the reflection of the camera is visible on Christopher's sunglasses.

Visible crew/equipment: At Eugene's wake, when Vito says that he's going back to the hospital, just as he heads toward the front door, we can see the reflection of the Panavision camera and camera operator.
Answer: That's not Jimmy, just a look-a-like. Jimmy's short and stout, the guy in "Christopher" episode is tall and medium built. The hair is also different.