Revealing mistake: The passenger of a taxi opens the taxi door, which an officer on the bike then collides with. If you look at the passenger, he never takes a look behind him to see the officer, but still quickly moves back into the taxi as if he knew that the officer was about to hit the taxi door. (00:17:55)
Revealing mistake: When the officer on the bike chases Wilee, the door to a taxi opens and the officer collides with the door. You can see that the window had been removed from the door to make sure the actor doesn't get injured. It certainly wasn't rolled down because the frame isn't even there. (00:18:00)
Revealing mistake: After the officer collides with the taxi door, Wilee tries to think which route to take. The second one he thinks up is him ending up hitting a jogger and the jogger getting run over by a van. It's noticeable they used a dummy. Notice how the body flips over, completely unrealistically. (00:18:20)
Chosen answer: I think that sound is the front wheel giving way. If you look closely, you can see that his front wheel is wobbling a little as he escapes. This may be why he ditches his bike and steals the cop's bike soon after.