The house that Sandy lives in is the same house used in The Godfather (1972), when Tom Hagen meets with movie producer Jack Woltz, preceding the iconic severed horse head scene.
The girls are Adam's real-life daughters Sadie and Sunny.
To promote the film, Adam Sandler visited Las Vegas Motor Speedway, and was filmed in character offering his services as manager to NASCAR drivers Dale Earnhardt, Jr., Joey Logano, Denny Hamlin, Kurt Busch, Ryan Blaney, Austin Dillon, Ricky Stenhouse, Jr., and Kyle Larson.
In Grown Ups (2010), during the beginning of the movie you see him talking with his agent, Sandy, on his cell phone. The agent, to whom he is speaking, is Sandy Wernick, on whom Sandy Wexler is based.