Harry Potter and the Sorcerer's Stone in 2001. UK Press/Getty Images Before Harry boards the Hogwarts Express at the end of Harry Potter and the Sorcerer’s Stone (2001), Hagrid hands over a homemade scrapbook filled with photos of Harry’s parents. It’s the type of movie moment known to make viewers tear up, and even Daniel Radcliffe did while filming it—but not just from emotion. As Digital Spy reports, producer David Heyman recently explained in an interview for Empire that Radcliffe’s green contact lenses caused an allergic reaction that made his eyes “puffy and red,” which was “quite appropriate for the scene.” It was only the first day of filming, and the allergic reaction was problematic enough that they decided to nix the contact lenses altogether. So Harry’s eyes are blue in the final cut of that scene, though they do look a little bloodshot.