Drew Powell, who plays Dash, said that he and the other two boys are like actual brothers. They fight sometimes, joke around and prank each other but they are very good friends now and hang out a lot.
All the math on the school chalkboard were real equations. The set decorators were very smart.
Swoosie Kurtz, who plays Tiffany, said the three boys who play Liam, Wyatt and Dash are "magic, they're just amazing and I just want to take them all home with me. They are adorable, and smart and so different each in their own way. "
The snowballs used for throwing were real. All the other snow in the boat scene is CGI.
Producer Greg Mottola grew up in the suburbs of Long Island and spent a lot of his childhood wandering around the woods and digging holes.