Really, what I’d like a spoiler for is the post-credits scene. I have -no- plans on seeing the flick (being a big Hellblazer fan), but everyone says there’s something interresting post-credits.
It’s like they filmed Matrix part 4. 
Interesting, but not important. We see
the dead guy, Chaz, taking off towards the sky with wings
You should see it. The film gets the the most important thing exactly right; namely, that Constantine gets all his friends killed.
–Cliffy