There are 18 moves in that handshake.
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1. Hallie and Annie are named after director Nancy Meyers and producer Charles Shyer's real life daughters.
2. The film states, "For Hallie" in its final credits. This is a dedication to Nancy and Charles' daughter.
3. The real Hallie and Annie had cameo roles in the film. Annie plays the towel girl who brings Elizabeth the first aid kit at the hotel while Hallie plays the girl at Camp Walden who asks where the Navajo bunk is.
4. Camp Walden is based on an existing camp for girls in Denmark, Maine.
5. Joanna Barnes plays the wicked girlfriend in the original The Parent Trap. She plays the wicked girlfriend's mother in this version. Both characters are called Vicky.
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