Visible crew/equipment: When the camera lifts up on the last shot, you can see a lighting screen reflected on the right glass wall.
Continuity mistake: After Carmela heads out, Tony grabs a Dove bar from the freezer and takes a seat at the counter. When Tony unfolds the Waste News, its front page changes between the close-up and side shots. The same thing happens between shots when Tony opens to the second page of the newspaper.
Visible crew/equipment: At the end, when Agent Harris introduces Tony to Agent Marquez and comments on the Mets, the reflections of equipment and the boom mic are visible on the store window.
Visible crew/equipment: After the loud crash is heard, everyone rushes to the front door of Satriale's. Just as Paulie and Tony open the two front doors in this exterior shot, the reflections of the camera and its operator are visible on the store's glass, at the right side of the screen.
Visible crew/equipment: When Catherine puts on Corrado's CPAP mask/headgear while he's asleep, it then cuts to the stove at Satriale's where Paulie is cooking up sauce, and at the start of this shot, a red tape mark is visible on the floor at Silvio's feet.
Visible crew/equipment: While Tony and his crew are hanging out at Satriale's, they hear a crash outside, and as they all rush out the back room, we can see a red T-mark taped to the floor.
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.