Apparently the pivotal point where the reshoots took over was the plane scene. In the original film:
perfected zombie-killing tool that's sort of a shovel/battle axe that would have been one of the few things from the book to make it into the movie.
- Gerry discovers that the cold weather is the best defense against the zombies as they freeze and are easier to kill.
- The plane did not crash as it does in the theatrical version.
- Gerry (Pitt) and his Israeli comrade, Segen, land in Moscow, where his phone (the link to his wife, Karin, and family) was taken away and he was forced to join the Russian Army against the zombies.
- Months pass, and Gerry is now a zombie-killing machine.
- Gerry's unit is tasked with clearing subway tunnels of zombie hordes. This is the first time we see the Lobo, a perfected zombie-killing tool that's sort of a shovel/battle axe that would have been one of the few things from the book to make it into the movie.
- Gerry comes across the Russian who stole his phone molesting Segen.
- Gerry gets Segen and his phone back.
- Gerry calls his wife, Karin, and he learns that she sells her body to keep their children safe.
- Gerry also learns that his family is living in the Everglades, where the dead will never freeze.
- Gerry then finds out that Matthew Fox's character is housing Gerry's wife and Fox tells him to stay away.
- Gerry makes his way back to the United States as a means to rescue his family.
- Gerry and his mates land on the Oregon coast to begin a fight across the States to make it to the Everglades, where Karin and their kids are being kept.
- Roll credits.

That's it. No resolution. No nothing really.