When Raymond Barnell is kneeling at the end, his gun moves different distances from him in different cuts (not including when it is kicked away).
When Raymond is pointing the gun at Paul towards the end of the movie, the trigger is cocked in the first scene, then in the next two it's not, then he cocks it, but in the next scene it's again not cocked. Then it's cocked, not cocked, cocked and as he turns and shoots at Margaret the barrel turns as he cocks the trigger for the second time just before he shoots.
Toward the end, a beat-up Ted leaves the house to go to the secret meeting. He comes right back in to ask his girlfriend to come with him and you can see that his eye make-up has changed.
When Paul Barnell hugs his wife Margaret in the kitchen to sooth her nerves, Paul is holding her arms against his chest, there is a split second cut scene and his arms are now around her shoulders.
When Margaret throws stuff at the guy checking her fridge, one of the grey tin cans is soft; the can crumples when she grabs it.
When Paul Barnell discovers the body in the dumpster he says, "911" and proceeds to dial three digits and you hear ringing. The tones the buttons make on the cell phone as the digits are pressed are actually "123".
The envelope from West Federal Trust with the pre-approved credit card offer has misspelled Platinum as "Platnium".
After the insurance investigators are done viewing Ted's video (which exposes the man loading the snowmobile as a fraud), the camera then pans over to Ted at his desk. Before it can pull in to a closer shot the boom mic (and part of the boom itself) is visible at the top of the frame.