Visible crew/equipment: As the ducks fly away, a crew member can be seen stamping their foot in order to scare the ducks. (00:06:40)
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.
Visible crew/equipment: As Alex, Salvatore and Hesh walk along the bridge, if you watch the right side of the screen you can see a crew member wearing a purple T-shirt and holding a piece of equipment high in the air. (00:39:39)
Revealing mistake: When Tony collapses in his back garden, and the barbecue grill explodes, some coals (supposedly thrown into the air by the explosion) land next to Tony's body. Watch this moment closely however and you can see that the coals come into shot from left of the screen and not above from the air as they should. Obviously thrown in by a nearby crew member, just off-screen. (00:19:48)
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.