- Gotham was completely destroyed (Ra's al Ghul's vision of Gotham in flames / Jeremiah's plan to blow up Gotham),
- Time skips to some years in the future (or the present if Gotham was set in the past),
- Gotham was rebuilt (this is the New Gotham),
- Jim Gordon is older (with a mustache, grey or white hair and a pair of glasses),
- Bruce Wayne is now an adult (and ready to become Batman),