1. Zack Snyder gave away an Easter Egg in an interview this week: if you remember the scene in the scout ship (fortress of solitude), he saw 4 chambers with dead Kryptonians in them, except one of them was opened. That was his nod to Kara Zor-El (Supergirl). Not necessarily an opening for a Supergirl appearance, but just an Easter Egg.
2. When the Bus flies off the freeway and into the River, they focus on a man getting out of his car to spectate. He sure looked a LOT like Ryan Reynolds.
3. When something happens where we get a close-up on a satellite (I forget what it was), you can see 'Wayne Enterprises' on it right before it gets destroyed. It's even the same logo design from the Nolan movies. (which was lifted from the comics, Snyder and Dark Knight/Man of Steel writer David Goyer has emphatically confirmed they're separate universes and Batman would be a complete reboot if he was in this one)
4. I don't think they can ever do a Justice League movie without retconning Superman's power. He was so obnoxiously unstoppable in this movie, it would be absolutely pointless to give him teammtes. They would just more people he'd need to save in the end.
5. The action scenes really were too much. Not too much action, but too faced paced, too much garbage going on. It reminded me of the Transformers movies where one greyish robot gets tangled up with another greyish robot and they roll around and destroy buildings and smoke is so thick and you're just thinking "I literally can't tell what's happening." There were some genuinely amazing and iconic action scenes that people will GIF for years to come. But there was a LOT of unnecessary filler action inbetween.
6. I have to agree with the 'not enough story/character development' reviews. The action was so thick and long-winded that I cherished each calm, character scene that happened in between. Whether it was Clark finding the scout ship or Lois meeting Jor-El... There simply weren't enough of them.
7. Overall, probably about the same as Iron Man 3. Good, solid summer blockbuster.
8. Oh man! I forgot! Even though they said he gets his power from the Sun's radiation, gravity, and the atmosphere, changing the atmosphere apparently complete sucks the power out of him. That was... a plot device just to make the ship scene more dramatic. And the World Engine I guess. I'm not feeling that one. But they did mention the Sun's radiation, so I guess they can fall back on that later....
9. Speaking of the sun, Krypton's was yellow. Clearly a yellow sun. Well, I guess it really was mostly about the atmosphere, then.