When Frank and the Lamberts are in the backyard he dumps the apples into the water basin. When Mark steps up to the basin to dunk for apples, it's obviously from a different take, as Frank dumps the apples in again.
When Cody shows up at the games, the father of the other family comments that Cody isn't a Foster/Lambert family member and Cody says he's Dana's fiance', which appeases the other father. However, Cody is Frank's nephew, and since they mentioned earlier that he had played in the family games before, it shouldn't have been an issue.