The dancing zombie had an original design that resembled Michael Jackson who passed away the same year this game had released. It was changed in 2010.
The Cob Cannon is the only plant that requires more than one square of the lawn grid to place it.
There's a rare chance that a zombie will be allergic to a wall-nut when they try to eat it.
This became Pop Game's most popular video game series in the 2010's including a sequel and several spin-offs.
When playing the slot machine mini-game, it's only so much time until an insane amount of zombies enter the lawn all together. This is possibly a tactic to making the chances of getting the 3 diamond achievement harder.