Among the topics that were brought up were the fate of their characters, working with a new director and seeing themselves grow up in the movies.
This is the fifth installment of the Harry Potter series and the first for director David Yates. He will be back to direct "The Half-Blood Prince." All three actors said they were happy that Yates is returning.
All three were asked to talk about their favorite scenes to shoot during the filming of the movie. Radcliffe chose the scene after he kisses Katie Leung, who plays Cho Chang in the movie.
He said everyone in the scene was in a genuine, giggly mood and it reminded him of the scene from "The Usual Suspects" when the characters in the line up were doing the scene and laughing uncontrollably.
Watson said she has some uncomfortable memories of shooting the scenes for Dumbledore's Army. The walls on the set were covered in mirrors and fire was used to create some of the effects in the scenes.
"It was like walking into an oven," Watson said.
One of the reporters then asked if anyone passed out during the filming of those scenes. No one did, according to the actors.
"We weren't cruelly treated," Radcliffe said.
For Grint, filming the scene for the Quote of Prophecies stands out.
"There was nothing there, no set at all," Grint said. "It was all green screen. Looking back, watching it was really weird."
Not that any of the actors have any insight to how their characters fare in the final book, but the three have some ideas of how they would like to see "The Deathly Hallows" end.
Watson said she doesn't want any loose ends.
"It would be nice to wrap the characters up," Watson said after Grint jokingly suggested that all of them should die.
"The Harry/Voldemort connection will hopefully sort itself out," Watson said. To which Radcliffe replied, "It's not that simple."