At 21:32, Frank places his drink glass on the table and moves his hands to the sides of the table. The next shot his hand is back on the glass.
After Danny tells Frank that the sugar is all he needs, he sets the can down and you can see the word diet on it. Diet drinks have no sugar.
When standing outside of the Reagan house Jamie's car is a Pontiac, but when Jamie is driving and brakes fail it is a Chevy.
Jamie wrecks his Chevelle because the normal brakes have been tampered with and don't work. But all he had to do was put the transmission in Neutral and apply the emergency/parking brake. If he knows so much about cars, he would know this.