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- $100 for all ringtones and themes
After acquiring the phone from Playboy X, go to the nearest Internet cafe. Buy all of the ringtones and themes from the ringtones site. Log out of the computer and you will notice that you only paid $100 for all ringtones and themes.
- 300
Reach the part of the game where Niko and Roman have a safehouse in South Bohan. In the house on the left of the table near the television is a pile of books. The middle purple book of a stack of three is titled "Madness & Blasphemy: The Do's and Dont's". This is an reference to the movie 300 where in the "This is Sparta!" scene, the lines "This is blasphemy! This is madness!" are spoken.
- A Revenger's Tragedy
The final mission "A Revenger's Tragedy" is a reference to the play and movie based on the play titled The Revenger's Tragedy.
- Annihilator helicopter
Kill all 200 pigeons. The Annihilator is armed with rockets.
- Avoid toll booths
Use any emergency vehicle, turn on the sirens, and drive (speed does not matter). The booth attendant will open the gate and you will have saved $5.
When in a car or a motorcycle, drive up to toll booth. Stay on the far side of the booth. Niko will stick his arm out, but not put money in the basket. The gate will still open.
Ride a motorcycle to the side of the pay toll wall. You will not pay a toll if you can drive through the small gap on the sides.
- Bowling alley logo
During the bowling date with Michelle, when you enter the bowling alley notice the neon bowling alley sign. Look closely to see that it resembles male genitalia.
- Bowling: Easy strikes
Select the first lane (all the way to the left). Take two full steps to the left. Hold Right Analog-stick Down for about a half second, then press Right Analog-stick Up. Do not add any aftertouch to the throw.
- Brucie's races
Get any car. When you get to the race, wait until the race starts. Immediately after it starts, shoot out at least one tire on each car, but make it quick.