While doing promotion for The Runaways back in March, Kristen Stewart and Dakota Fanning talked about the on-set differences between The Twilight Saga: New Moon, directed by Chris Weitz, and The Twilight Saga: Eclipse, directed by David Slade.
All two films and the first installment, Twilight, directed by Catherine Hardwicke, featured Stewart, Robert Pattinson, and Taylor Lautner.
"I feel like the difference on the third one is that we all are so used to going back to this story that we fell right back into it," Stewart told Cinematical. "… We were so comfortable with these characters that we have established a dynamic with the cast and the producers, and we would just sort of do our thing."
Fanning says she spent about three days working on each installment of the Twilight Saga franchise, appearing at the end of filming in both New Moon and Eclipse.
One of the most anticipated movie events of 2010, The Twilight Saga: Eclipse opens on June 30.
source Via http://www.imdb.com