So I've been playing the ptr since it launched, and just thought I should share what I've run into.
1- You can completely brick Axl's AI, causing him to stand completely still and allow himself to be 90%'d with 0 effort, by standing underneath him and preventing him from starting phase 2.
2- I think I've finally figured out how to willingly cause the low gravity bug, resurrect your buggy right as you take a hit and it seems to cause it everytime. I won't lie I've been using it to gather on my ant, as it also reduces fall damage
3- The orc wave is not a "raid" its an ambush, as such it essentially invalidates all defensive building, as if you're in base when it spawns you get flyers *inside* your defenses.
4- There is a random large stretch of land, near the icecream lab, that dismounts you randomly, I assume due to the story cave underneath.
5- Wolf spiders (very rarely) will just walk up to you and stare at you, horrifying but also funny, but I doubt intended lol. If it is you guys have a sick sense of humour :P.