Don't fall too hard on top of money on the ground or there's a rare chance of you instantly dying from an acceleration bug
Yep. You can also die the same way to a spitter spit or a gl shot, although these usually launch you horizontally (if you are super unlucky and jump right as a shot is going downwards, then yea you can accelerate to the ground xd)
Always bring a box into saferoom so you can get more chances of pointboxes in case of map reset (definitely not to kill everyone with boombox)
You can swap weapons while picking up people. It saves you the small animation time when swapping if you are in a really tense situtation