When Hal is talking to Lois in the room, he puts his arm down by his side but in the next scene he has it palm-up near his chest.
When they knock over the table with the golf cart, the cake top clearly falls off, but in the next scene the cake is fixed.
When Hal talks to his dad in the kitchen ("Don't do the face"), two pieces of white paper are on the fridge door, sometimes in line with each other, at other times at right angles to each other; sometimes a company logo is visible, sometimes not.
When they are driving to the reunion the background shows them in a neighborhood with leafy trees but in the next scene they are in a downtown with palm trees.
When Hal talks to his dad he points his finger at him, but in the next scene he has his arm by his side.
While they're driving to the reunion, Hal tries to relieve the tension by asking Francis how his work is going. Francis leans forward and the three boys that should be in the back row (Reese, Malcolm Dewey) are not only in the wrong order, but also different fill-in actors; the character that is sitting in Reese's seat is wearing the shirt that Malcolm should wear and is a different boy altogether--and "Dewey" has blue eyes and brown hair.