Fiona's hair suddenly becomes much longer in the third act.
When they are chasing the yacht in the Zodiac they are in the wake of the yacht they are following. In shots from other angles, they are running in clear water.
When Michael and the drug dealers are getting away after stealing the fake drugs, spray from camera boat is visible.
At 12 minutes, when Seymour is escaping in his Corvette while being shot at, the stunt driver (a bald, black man) can clearly be seen driving the car.