In the mission 'No. 1,' if you go to the race start but don't trigger it, then leave the game unpaused for one in-game day, all rival racers despawn. When you finally start the race, you're alone in first place with Brucie and automatically win.
Source: Glitches in GTA IV — CC BY-SA
Ped's taking a dirt nap, but at least he's still there — unlike every rival racer in 'No. 1' if you let a full in-game day pass.
Cars spawning out of nowhere on Happiness Island, while 'No. 1' rivals do the exact opposite — despawn into thin air.
Cops forgot their jurisdiction, same way 'No. 1' rivals forget to exist after one in-game day of waiting.
Peds cloning themselves while 'No. 1' racers pull the ultimate vanishing act — leave it a day, race alone with Brucie.
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