Thanks to StackExchange, I'll be watching the eight Harry Potter films soon. It'd be nice to get a blog post out of this, but I'm not really sure what to write about (and I'd like to have something in mind when watching them).
There are thousands of reviews of the films online already (most of the films are quite old, of course), even of the latest one. By the time I get to Deathly Hallows Part II not only will there be thousands of reviews of the film, but most likely even of things like the DVD extras.
Does anyone have any suggestions about something interesting and vaguely original that I could write about? (I've got one idea, that I'll post as an answer, but I'm not sold on it, and would welcome a better idea).
For background: I've only seen the first film (and bits of the second) before. I've read (and just re-read) all the books (including Beedle but excluding Quiddich and Fantastic Beasts). I'm not an expert on film, so something like focusing on cinematography wouldn't work well.