When the "Cheaper by the Dozen" movies were made, neither Steve Martin and Bonnie Hunt, who played the parents of 12 children, had ever had a child in real life. Steve Martin first became a father years later in December 2012, when his wife Anne Stringfield gave birth to his first child, a daughter named Mary.
Events in the Labor Day Cup included: the Egg Toss, Wheelbarrow Race, Diving, Sack Race, Archery, Egg and Spoon Race, Water Treadmill, Volleyball, and the Tie-breaker Canoe Race. Not seen, but shown on the scoreboard were: Tug-O-War, Baseball Dunk, and Water Skiing.
This is the second movie that Bonnie Hunt's character can be seen dancing on a dock with her on-screen husband. The first was in Beethoven the 2nd while they were also vacationing to a lake with the family and puppies.
The movie pays homage to Romeo and Juliet; with the Murtaughs and the Bakers spoofing the Montagues and the Capulets; with Eliot Murtaugh and Charlie Baker spoofing Romeo Montague and Anne Murtaugh and Sarah Baker spoofing Juliet Capulet.