1. Since dragons are dangerous and also fictional, actors have to share scenes with green balls on sticks that will be filled in later

2. There's a lot of people in costume in this scene, but for larger-than-life scale you need a bit of green screen

3. Using humble, real-world backdrops up front and dropping in fantastical castles in the background is a common practice

4. In a way, it's kind of impressive that they built any part of a giant ice wall to begin with

5. Some scenes are made of so much CGI you could almost call it a cartoon -- not that it's a bad thing

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