Unlock the Deinosuchus
Name an exhibit Super Croc to unlock Deinosuchus.
The Rock
Rename Maintenance Worker 1 into The Rock and almost all the scenery will turn into rubble. This happens also with all the animal shelters except for the Dino Cave and the Dino Ice Cave!
Hard as Rock
Rename an exhibit to Copralite Corner, and dinosaur poo inside will turn into large stones.
Run, Doc
Rename a scientist to Dr. Scholl, and he will start to run.
Mermaid statue
Put a mermaid statue in a tank. It will shake and come to life!
More Zoo Guests
Name an exhibit wonderland and get a bonus toward the chance of guests entering the zoo. This will not increase the max guest limit of 1000.
Get Unicorn
Name an exhibit Xanadu, but remember don't do it to a new exhibit because it will come up with an error. Go to the animal list and there will be a unicorn for purchase!
Research everything
If you name a guest Hank Howie and then exit to the main menu, once you get back into the game everything will be researched.
Fix all fences
Name a male maintenance worker Bob V and all currently broken fences are fixed.