Updated 15 November 2002, 08.24

 Click here for our interview with Rupert Grint

Tom, 15, also said he picked up tips from Jason Isaacs, who made his first appearance in Chamber of Secrets as Draco's dad, Lucius Malfoy.

"He's incredible - the most amazing actor I have ever met," Tom said. "He can switch from being nice to being evil in a second."

 Click here for our new improved HP section

Both Tom and Matthew, who plays Neville, agree working on the second Harry Potter film was easier than the first.

"It's all like one big family," said Tom. "Everyone plays their own crucial part towards the film."

Matthew agreed. "The second film was a lot calmer than the first," he said. "You know everyone and you're not afraid of mucking up in front of the bigger actors, like Kenneth Branagh. He was brilliant."

'Stuffed cotton wool in my cheeks'

Matthew, 13, told CBBC Newsround Online a few Potter filming secrets. Because he lost weight towards the end of the shoot, the crew had to make sure he didn't look really different.

"They stuffed cotton wool in my cheeks to make me look fatter in the scene in the greenhouse with the Mandrakes, which was one of my last scenes," he admitted. "It was quite funny."

He also had to grow his hair to play Neville, and he cuts it short as soon as filming finishes, because he doesn't like it long.

'JK is very secretive'

Matthew revealed he had a lot of trouble filming the scene in The Philosopher's Stone when Hermione performed the Petrificus Totalus spell on him. He had to fall to the ground totally rigid.

"I kept doing it and doing it - I even practised at home with my brother - but eventually they had to get a stunt man in because my legs kept flying up at the ends," he admitted.

Matthew also insisted JK Rowling was just as secretive with the cast as she is with the public about the future of Harry Potter.

 Which character does JK kill off in book five? Vote here

"I have no idea who dies in book five," he said. "JK Rowling is very secretive. She keeps dropping a few hints but she doesn't tell. I hope it's not me!"

Watch/Listen

Hear Story

More Info

Rupert Grint COS: full interview

Emma Watson in COS: full interview

MEGA Potter special section

Past Stories
	Rupert Grint: 'Kill me before I kiss Hermione!'
	Emma Watson: 'Success hasn't changed me'
	Mistakes already spotted in new Potter movie
	Potter previews make millions

Web Links
	Harry Potter site
Note: You will leave CBBC. We are not responsible for other websites.