4. This Scene
Justice League: War loosely adapted this scene not too long ago, and if Zack Snyder doesn’t do the same with his Justice League movie, he’s missing a really great opportunity! If Warner Bros. decide not to use Hal Jordan, it might not work quite so well, but establishing the tension between Batman and Green Lantern with a moment like this would be an awful lot of fun. It also shows off the skills of the Caped Crusader, and the cockiness of the Emerald Knight in comparison. While 2+ hours of the League bickering wouldn’t be an awful lot of fun to watch, this sort of friction-fraught team dynamic at least at the very start would make for some enjoyable moments as the very different superheroes all come together to fight a threat bigger than them all.