When Warren and Larry are standing on the street with their ferns talking the NYPD police car 807 drives by and then drives by again a second time five seconds later.
When Warren and Larry are standing on the street with their ferns talking the woman in the blue dress with the brown purse passes in their background going from left to right and then passes them again going in the same left to right direction a short time later.
When Larry calls Carol at the bank during the robbery she is tied up and sitting toward the back of the bank between a man and another woman employee also both tied. In the next scene she is sitting 20 feet closer to the front door of the bank still tied up but behind a desk by herself.
When Warren and Larry are standing on the street with their ferns talking it is initially a very overcast day with only a slight building shadow showing near the curb on the other side of the street. Toward the end of the scene it is suddenly a very bright day and a very visible shadow has moved 2/3 of the way across the street towards them.
When Larry is running, he pays a toll to run across the 59st bridge. There is no toll on the 59st bridge.
The mechanical chess game moves its rook and says, "Queen Rook to Queen Seven," taking Warren's queen, then says "Checkmate." The space it moves the rook to is King 7, not Queen 7. It is also not checkmate because there is no piece guarding the rook. Warren could have taken the rook with his king.
After Henry jumps off the bridge, he can be seen lying on the stunt mat as Larry walks by right afterward.
After Larry runs over the 59th Street bridge, Peter Luger's restaurant can be seen in the background. Peter Luger's is in Brooklyn, not Queens, where the 59th St. bridge connects to Manhattan.
The maitre d' burns the check that Iris wrote her phone number on, but it's only been about 10 seconds since she walked away so Larry could run after her.
When the officer gives Larry the ticket for the dog poop he fails to take down any of his details.