Filming and production[edit]
The Waterboy was mostly filmed in the Central Florida and Orlando area as well as around Daytona Beach, DeLand, Florida, Lakeland, Florida, and surrounding areas.
The Mud Dogs home games were filmed at Spec Martin Stadium in DeLand, Florida, home of the local high school team (the DHS Bulldogs). The classrooms and gym where Bobby takes the GED are part of Stetson University, also located in DeLand. Stetson's Carlton Student Union building is featured in the scene where Bobby is told his mother has been hospitalized.
The scenes involving mama's cabin were shot on Lake Louisa, in Clermont, Florida.
Coach Klein's (Henry Winkler's) office was a stage built inside of the Florida Army National Guard Armory in DeLand, Florida. It is home of Btry B 1st Bn 265th ADA. If one was to look closely, in the background of the practice field scenes, they can see the Armory and some military vehicles.
The initial exterior shot of the University of Louisiana stadium was EverBank Field in Jacksonville; the interior of the stadium is actually the Citrus Bowl in Orlando, Florida. The Citrus Bowl was also the filming location for the climatic Bourbon Bowl game, while the flyover shot at the beginning of the game is of Williams-Brice Stadium at the University of South Carolina in Columbia, South Carolina.
The "medulla oblongata" scene was filmed at Florida Southern College in Lakeland, Florida. The extras in the scene were students at the college, and the scene was shot on campus in Edge Hall.
https://en.wikipedia.org/wiki/The_Waterboy