1. Liking a level comment while having closed the info box.
2. Give an object a group ID higher than 1106 (patched in 2.1)
3. Select an object and activate Free Move. Then you hold it and open the pause. Tap "Save and Play" and in the same time, move the object very fast.
3b. It also works by deleting an object, just delete it directly after you've tapped Save and Play.
4. (This destroys your level completely!) Go into the editor. Hold the pause button and tap the back button. In this menu (still hold the pause button!) you have to hold Save and Play. Release the pause button. In the second pause menu, also hold Save and Play. Release them both at the same time.
You will spawn in a tiny, empty map; the righter part of the end is invisible and the cube goes through it (you can't jump). Tap the pause button to crash.
5. (You must have unlocked the normal vault) Go to the main menu. Hold the twitter button (or any link button) and go to the settings. Hold the vault lock; now release the link button and (shortly after that) the vault button. At last go back to the game (don't kill it!). If you did the timings right, you'll have a blackscreen and will get an error message after ~10 secoonds.
I know I don't have a life.
Also, RobTop has already patched all of the crash bugs on your list (except the lag one).