When they bring out Mitch's cake with the roman candles and he is talking, the number of still burning candles changes with each shot, going from two, to four, and back to two.
At 4:30, Mitch is in his foyer and through the windows on either side of the front door you can see an SUV pull up from right to left. When Mitch walks outside, Paul opens the passenger door of the SUV and it is now facing left to right with no time allotted for Paul to turn around the SUV.