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.
Hal talks to his dad in the kitchen ("Don't do the face.") There are two pieces of white paper of the fridge door. Sometimes in line with each other. At other times at right angles to each other. Sometimes we see a company logo. Then 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 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 hal talks to his dad he points his finger at him but in the next scene he has his arm by his side.
When they are driving to visit Hal's family,Hal tries to relieve the tension by asking Francis how is work. You see Francis leaning forward and the three kids that should be in the back row (Reese, Malcolm Dewey), are not only in wrong order, but also different fill in actors, you notice it as Francis leans forward the character that is sitting in Reese's seat is wearing the shirt that Malcolm should wear and is a different boy all together. Also you notice "Dewey" is a brown haired blue eyed young kid.