Factual error: When Bullock and Grant are stuck in traffic they are on the ramp of the upper level of the Queensboro bridge. No trucks are allowed on the upper level of this bridge, so the RV, the truck behind the RV (the one with the two guys who are looking in the bathroom window), and the other trucks that are stuck in traffic on this ramp would not, in reality, be allowed there. (00:55:15)
Factual error: During the tennis match, Hugh Grant hits from the right side. Sandra Bullock returns it to him, but Grant is then standing (not moving) by the left doubles alley. The entire scene has people hitting errant shots that are improbably playable.