Towards the end of the movie, Alex is shown decorating a Christmas tree in his restaurant after his landlord has confiscated his furniture. But right at the beginning of the movie, in the very first scene set in Alex's restaurant, the same tree was shown already fully decorated with the same decorations and in the same position.
When Lee is picking up glasses in the strip club, the shiny gloss edge on her chest tattoo reveals it to be a transfer.
The chain lock on J.J.'s apt. door is incorrectly installed, making it worthless. The 'slot' piece on the door should have the hole the end-of-chain-fits-into away from the door edge, not next to it.
When Alex is decorating the Christmas tree, the boom mic dips down above the star tree topper.