2.   Lay a trail of petrol and you can ignite it with your car's exhaust.

3.   If you attack Micheal's house, he will text you and ask you to stop firing Rockets.

4.   If you take photos of people, they are liable to punch you.

5.   While in an expensive/ridiculous vehicle, people will take photos of you.

6.   If you injure a family member of Micheal, they will text you an angry message from Hospital.

7.   You can customize your parachute at ammunition stores.

8.   Your clothes get wet depending upon where the water touched.

9.   You can see people stoop and run when it rains.

10.   You'll automatically strap a helmet on if you stay stationary for a moment while on a bike.

11.   As Tevor, you can walk around to the front of his trailer and huff gas. This makes him high and he will wake up in a random location.

12.   In a convertible you can open the roof (by pressing the D-pad right).

13.   You can see power line swaying in the breeze.

14.   There is an Orange stand near trevor's trailer in Blain County. You can shoot the big ball over the building to send it rolling down the hill.

15.   You can hop in a bulldozer, found at most Los Santos construction sites, and operate its digger.

16.   Your dog Chop will 'you know what' in front of you.

17.   The name of Trevor's buissness, TPI Enterprises, is an Australian company that processes opium poppies.

http://www.tpienterprises.com/

18.   There is a frozen alien under the bridge of Ludendroff, North Yanktonn.