Some infos that might be helpful:

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Flashlight

Toggle the flashlight by quickly pressing your "use"-key twice.

Generators

There are 3 generators on the map.
Power and light is turned on when all 3 generators are running at the same time.
A single generator will die randomly every 5-15 minutes and turn off the power.
Countdown starts as soon as all 3 generators are running.
While power is out, your perks are disabled.
Generators don't die during Pack-A-Punch rounds or during the last wave.

Gobblegum Powerup

If you pick up a Gobblegum Powerup, it will give you a random gobblegum.
If you already have a gobblegum, your current one will be replaced.

Pack-A-Punch

Pack-A-Punch comes down to the balcony every fifth round (5,10,15,...) and stays until the next round.
Power needed. Pack-A-Punch will not go away while it's being used.
Generators don't die during Pack-A-Punch rounds.

Ammo Crate

Ammo crate price is the round number multiplied by 250. (Max cost: 10.000)
It will fill up the magazine and stock of your current gun.

Growing Teddys / Increase Perk Limit

Kill zombies near teddys to grow them. Every finished teddy will increase the perk limit by 1.
There is a chance of them also dropping a powerup.

Craftable Shield

There are 3 parts needed for the craftable shield.
They are always in the same spots:
TV Room (upstairs), Living Room (ground floor), Bar (basement)
Build the shield at the back side of the building.

Unlockable Ending

There are 40 possible randomized spawn points for 20 parts across the whole map.
Collect all of them, go to the radio at the spawn, repair it and talk to the guy.
To initiate the evacuation, all players need to be in the spawn zone.
When you initiate the evacuation, you can't leave the spawn zone anymore.
Survive 10 minutes until the helicopter arrives.
Zombies are weaker but the amount of them increases heavily.