Towards the end, Denzel drives his car into 2 cars trying to get Ethan off the hood. After that scene ends you see Denzel driving the same car and the front and rear of the car look nothing like they did when he was crashing into the cars.
The scene at the start of the movie where Ethan meets Denzel in the diner - it is the same diner that is used in the movie "Seven," where Morgan Freeman meets with Gwyneth Paltrow. If you watch these two scenes, you can see exactly the same camera angles (i.e. the cook cracking eggs onto the hot stove).