Filming Avatar movies is no small feat, and it should come as no surprise that it takes time for James Cameron and co. to shoot those massive blockbusters. The second and third installments in the franchise were actually shot simultaneously over several years, and a lot can change in that period of time. As cast member Signourney Weaver explained to CinemaBlend, during that stretch, she got to see the younger actors grow up. Weaver also joked about that, while the kids themselves talked about coming of age on set.
