I can't find a thread where people can post some random glitches that might be used somehow in speedrunning of this game. So, yeah, I'll create one.

Let's start with this:

You can find a link with an explanation in video's description.

I don't think FI cars are usable in any way in a speedrun, so the interesting part here might be transfering mission states from one character to another + unfreeze mechanic when leaving the taxi before the taxi mission actually starts. For example, you can unfreeze yourself while buying stuff in food stores, picking air\water-vehicles, etc.

Same way you can transfer Franklin's races to other characters. I don't have a video for this one but I'll record it when I have time.

You can find few other glitches and their uses on my channel but to me they seem even more useless than the one's above.

Anyway, maybe someone will post something else here.