These 9 "Doogie Howser M.D." Facts Will Have You Rewatching Those Old Episodes In No Time

Neil Patrick Harris told James Corden that he watches a rerun from time to time, but finds it weird because of how high-pitched his voice was. 

Steven Boncho told the Archive of American Television that he thought of the idea for the show while he was sitting on the toilet reading a New York Times story about child prodigies. 

Max Casella, who played Doogie's friend Vinnie, was 21 when he appeared on the show playing a teen.  

Show creator Steven Boncho planned for Doogie to leave medicine to become a writer, but after Boncho left the show, it went in a different direction.

NPH was only 16 during the start of the show and was still growing. His shoe size changed five times over eight months. 

Back to the Future's Doc Brown (played by Christopher Lloyd) appeared in an Earth Day special of the show. 

ABC didn't like the pilot or Neil Patrick Harris but the show tested well with audiences and was put on the air. 

During the 1991-1992 season, Doogie Howser beat out NBC's Seinfeld. Both shows aired on Wednesdays at 9 pm and Seinfeld hadn't become a huge success just yet. 

When the show premiered in 1989, TV Guide asked around to see if a 16-year-old really could become a doctor. The dean of students at John Hopkin's at the time, said they'd never admit a student Doogie's age.