Go to the scene with Mr. Pink and Mr. White in the bathroom recounting the scene of the crime. When it flashes back to Mr. Pink running from the cops with the bag in his hand, pay attention to the buildings they run past. It's obvious that they pass the exact same set of buildings twice... The most noticeable being one that has "HARDWARE" (I believe) written in big letters on it. First you see Pink pass it up, then the cops pass it, then Pink passes it up again.

It's one of those things where once you see it, you'll notice it every time.