In Dead Rising for the Xbox 360, there are several different endings you can see in 72 hour mode depending on how well you do during the game.
Ending A – Solve all cases, talk to Isabella at 10 am on the 22nd, and be at the Heliport by noon on the 22nd as well
Ending B – Don’t solve all cases, but be at the Heliport by noon on the 22nd
Ending C – Solve all cases, but don’t talk to Isabella at 10am on the 22nd
Ending D – Remain a prisoner of the Special Forces at noon on the 22nd
Ending E – Don’t solve all cases, and don’t be at the Heliport by noon on the 22nd
Ending F – Fail to get all of Carlito’s bombs on 7-2