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 February of 2013 when his wife Anne Stringfield gave birth to his first child.
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.
During the scene where Steve Martin gets off the boat after knee boarding with Alyson Stoner and Taylor Lautner, Shawn Roberts and Taylor Lautner both make a comment about Steve Martin but their mouths don't actually move.