1. Follow up on the Superman cameo, they better have either officially kept Henry or picked his replacement by the time Shazam! 2 is mid-filming or they are even more inept than previously thought
2. Actual Black Adam/The Rock cameo, as small as a post credit scene, just to finally show off the character design
3. Mr. Mind to be cute and hardcore malevolent as fuck
4. Monster Society of Evil
5. Sivana to be sickly or something, maybe even put him in a wheelchair since Mark Strong is pretty well built.
6. They call Billy 'Captain Thunder' and the other kids do the gag of cycling through ridiculous names this time. Bonus points if Mary settles on 'Mary Marvel' by the end of the movie since there's no reason she can't have that name and it sounds like a solid hero name on it's own. It'd also be a decent middle finger at Disney.
7. Talky Tawny