To do the endzone glitch to escape the safe zone, make sure Shift Lock is turned on. Activate Shift Lock and press right up against the end barrier (or any other relatively thin wall) with your back to it. Then, while moving backward (Shift Lock still enabled), disable Shift Lock. The turning motion of your avatar combined with your backwards movement should throw you to the other side of the wall. If it doesn't, try a few more times. Do take into account that this can require practice, as you need to get the timing just right to phase through the barrier.