Peter and Elizabeth are at a location that is presumed to be Rockefeller Center. The background is obviously green-screen. Also, another couple leaving are visible behind Peter, disappear when the focus changes to Elizabeth, and reappear when the focus is back on Peter.
When Neal momentarily blinds Renee by smearing dye into her face, the guns she is holding gets partially colored with the dye. However, in the next scene, when Peter snatches the gun from her, it is wiped clean.
When the bank robbers take the bank manager into the vault, the vault door is wide open. When the camera switches back to Neal and Peter outside the vault, the vault door is half closed.
When Neal and Peter are drinking beers in Peter's home, Peter's beer alternates between sitting on the table and being held by Peter in successive shots.
The close up of the money in the safety deposit box shows every bill with the same serial number on each one. They also match the bills Neal steals in the opening scene.