No but you can buy them on xbox live marketplace
First there is no Hitler zombie, and second there are no last levels for zombies mode
First You enter in the zombie cheat then activate it then select new career
The first few levels are unlocked at the start. To unlock later levels, achieve a medal in all prior levels at one engine class.
It unlocks the 3rd zombie mode. It is kinda stupid at first, but I'll get better
Normally in the 2 first levels of plants vs. zombies the zombies are the newspaper zombie, zombie and zombies that are in costumes are in those levels.
First of all if you beat the whole campaign, you will unlock "Five" which takes place in the pentagon. You can also get out of the chair in the main menu and go to the back of the room to use a computer. You can just put in "DOA" to unlock the mini zombie game which is a third person shooter, but is is still fun. And of course one map is already unlocked in the begining when you get the game.
If by movies you mean levels, you have to finish the very first level in order to unlock pretty much all the levels and even the port
No, if you beat the first level in campain, you can unlock the first zombie level. But, to unlock the others, you either have to beat the campain or, assuming you know how to break out of the chair, break out of the chair and go to the computer and type in, 3ARC UNLOCK
You must complete all levels
You get the first map straight away now, the other maps have to be bought
Zombie Proof is an armor ability, you can customize it with 10 Candle of Life which you can get by stealing from Fallen Monk in Zanarkand and Don Tonberry in Monster Arena (you need to unlock it first)
You must first pass all the levels with as few moves as possible to collect all the gold stars.