Continuity mistake: When Molly takes Mikey into work and he is under the desk, Rona is still wearing her shoe. Yet when the scene changes, her shoe is missing when Mikey starts tickling her foot. Then when the boss realises that Mikey is under the desk, her shoe is back on. When the shot changes again, her shoe is off.
Continuity mistake: When John takes the kids to the movies and is trying to weasel some free popcorn, it is obvious that someone shakes the baby girl to make her cry.
Continuity mistake: When Mikey is underneath the desk and goes to put white out on the man's shoe there is already white out on the shoe. Probably from a previous take.