Daniel: I never actually think of the fact that, yeah, millions of people have seen me grown up from the movies.
[All three Potter stars are full-fledged teenagers and you can see and hear the difference. (Pics of the three from SS NY Premiere, then pics from PoA, all smiling.)]
(Shows scene from SS: Ron's line, Sunshine, daisies, buttermellow ..)
Rupert: (With a freaking adorable smile) My voice hadn't broken then, and now, it's pretty low.
Hospital wing scene from PoA, showing Ron on the bed:
Ron: It was Scabbers who did it.
Ron: My rat, Sir.
Daniel: Who's grown the most? Rupert, without a shadow of a doubt.
Rupert: Yes, it's weird, it's really weird, and I don't feel that I've really changed, but when I look back at the other films, I was tiny.
[Shows chorus singing. Harry and Hermione opening a door ... Pat saying the most difficult thing was replacing the late Richard Harris.]
Dumbledore: Good luck.
Michael Gambon: I started using an Irish accent, so the director said, "What was that you were doing?" And I don't suppose Richard was Irish.