I've been doing to find the jet pack, and the people trying to get theclues on how to get it are really awesome, but have not unlocked yet. so, i (still) remember the jet pack cheat from San Andreas, tried it, and it didn't work. BUT HERE'S THE INTERESTING PART, I was putting in other cheats I had remembered from SA and SOME OF THEM WORKED.
I looked it up and matched up cheats from both games and noticed 1 thing. The cheats from SA that have the up button, are replaced with different directional buttons.
Here's why I'm posting this, and not the cheat for the jet pack = I'm lazy.lol. but I'm sure if some one had the time and patience with trying different combinations for replacing the up button in the jet pack cheat from SA, might just unlock the cheat for the jet pack in gta v (assuming there is a jet pack) and possibly unlock other new cheats.
Good luck, and if you do find the cheat for the jet pack, PLEASE POST IN HERE OR PM ME, THX
Edit: I assume the up button doesn't work with cheats in gta v because it brings up the phone and could possibly lead to calling people or buying unwanted stocks.
This is a glitch in the game I believe. In the mission where you parachute from the maze bank, if you beat Dom to landing on the truck ( by at least 10 seconds) Thetruck driver says " Dom didn't make it?" And it prevents the next mission from Dom being activated. If you land on the truck aftr Dom,, the truck driver says "you guys were awesome".