[...] You can't reuse an article safely without attaching the entire GFDL. [...] That applies to all copyright licenses, the GPL included.
It doesn't apply to CC-by-sa.
Indeed it does. It is the whole point of a license, you cannot know the license terms if you cannot see the license.
| * For any reuse or distribution, you must make clear to others the | license terms of this work. The best way to do this is with a link | to this web page.
Attaching the entire GFDL 1.2 text is not meaningfully "free" for photos or single-page texts. And how do you reasonably implement it for a motion picture.
This would fall under fair use. But I fail to see what a motion picture has to do with this, if you use a copyrighted work, you have to note that, and its license.