I love movie lessons and have a few things I do with my kids c:

1. A worksheet where they have to match the character photos to their names, or I have them write the name of the characters [to make sure they're paying attention. Older kids in English my young ones or less English speaking in Hangul]

2. Have them answer true and false questions about different scenes in the movie [True or false: Edmund as the white queen for a hamburger? What did he ask for? etc]

3. A worksheet with different scenes and I have them order them [after they've watched that part of the movie of course] then I have a power point that shows the  correct order and we see if they're right.

4. Since you're watching Narnia you could have them draw their own Narnian creature and then write a few sentences about it. [Half man half tree, can transform in moonlight etc]