List of glitches/bugs that I know whether they are old, intentional, current (in order of race thread that is currently there) :
Undead Revival Suicide Bomber Spam for a few seconds [Patched]
Human Teleport Clipping
Human Bash acting as Banish effect as well [Patched, somewhat?]
Human Bash tilting screens
Orc reviving with a scroll
Night Elf killing itself with World (still have NO clue how to replicate this)
Blood Mage Banish tilting screens
Warden reviving with a scroll
Warden Shadow Strike instadeath / random procs of things other than poison [Patched]
Molecule invulnerable while moving (only seen this one once, wasn't even intentional if I recall)
Genocide Revival Spam (can be considered breaking rules as well, depending on how it is used)
Succubus Hunter Barely Visible
Panorama tilting screens
Vagabond stuck visible/invisible
Vagabond has no scout (rare)
Strider Bomb Teleporting Exploit
Hell Hunter Ultimate Knife Race
Hell Hunter many nades Any Race
Hell Hunter Unlimited Secondary Ammo [Pre-update Glitch, may come up again who knows]
Hell's Demon 1-Shot Everyone Glitch [Patched]
Hell's Demon Crashes Server for ALL reasons [Patched]
Magician Crow as another race (Spider-man Crow, Vagalion Crow, etc etc.) [Patched]
Shadow of the Void Free Ult Immunity [Patched?]
Nebula showing secondary while invisible
Beast Multiple Respawns (I've yet to see myself respawn more than 1 times; could be my luck idk)
Rapscallion Ultimate seen through walls
Dragon Fly Shits Guns! [Patched]
Vagalion stuck visible/invisible
Santa trail disappears
Santa many HE nades trick
Santa SpeedRacer [Patched]
These are majority of the glitches I've come across both pre-CSS update and now. Majority of these are patched. Others still happen. May be more I haven't listed, but as far as doing them, ZERO has done an excellent job fixing majority of our problems. As far as replicating most of these, I still know how to do. Some are self explanatory based off the name I gave it. Others, not so much.