1. The White House exploding again.
2. Not everything else, though.
3. President Thomas Whitmore making a killing on the lecture circuit.
4. A happy ending for this family.
5. Some explanation as to how this plan worked.
6. More dogs not dying.
7. A monument dedicated to Russell.
8. The redemption of James Rebhorn.
Do you even remember that his character's name was Albert Nimziki? No, you just remember that he was a dick. Anyway, he already got fired. Let's have him do some actual good in the sequel to atone for his past transgressions. Alternately, he could keep being a dick and die horribly.
9. Mae Whitman has a major role.
10. No Judd Hirsch.
11. Cheekier aliens.
12. Another Star Trek alum getting offed.
13. Harvey Fierstein.
14. More absurd product placement.
15. An anti-smoking message.
16. Promotional tie-in floppy disc games.
17. Jeff Goldblum looking hot.
The circumstances are frankly irrelevant.