Revealing mistake: When Eli and Klitz are being chased by Mule, Eli and Klitz go over the railing and land on the table. After that when Mule lands on the table you can see the table break a split second before he lands on it.

Revealing mistake: Just before the security guard smashes his car into the oncoming car, you can see he has been replaced by an stunt dummy. (00:09:25)
Revealing mistake: When Matt is chasing Dannielle's car naked, it is clear that a body double is being used as he is taller and has lighter color hair than Matt.
Answer: 1969 Pontiac Le Mans GTO.