Continuity mistake: When Reuben and Polly go to that Latin club to dance, after he's had salsa lessons, you see the guitarist pointing to encourage him. Now, he looks as if he's a left-handed guitar player, but a minute later you see him in the background playing right-handed. If you look for it, you can see that his guitar is a Gibson, and on the "lefty" scene the logo on the headstock is obviously reversed, which means the shot got mirrored in post-production.
Continuity mistake: When Reuben and Leland go to the roof and Leland prepares to base jump, after he takes his jacket off, the parachute straps across his chest are undone. In the next shot they are properly fastened.
Continuity mistake: When Reuben and Polly are in the cabin of The Roo Shooter they are having an argument. Behind Reuben is a clock, in each shot of him the time on the clock changes.
Continuity mistake: At the beach, Reuben tells Lisa that he's bought the house. After she takes her right hand to her mouth in awe, her left hand is either lying on a book or on the sand.
Continuity mistake: When Reuben and Polly meet, before he gives her his card, she takes her hand to her head. From the opposite angle it's lowered. This swaps back and forth.
Continuity mistake: In the scene right after Reuben discovers Lisa cheating on him, Reuben begins to pack his truck to leave the island. The truck is facing the ocean as he loads the truck. However, a split second later he gets in the truck and the truck is facing away from the ocean, then when Reuben backs up, he backs up towards the ocean.