Protect From Magic does no defence against Green Dragon's fire.
When you leave the RFD minigame to get food or something like that all the waves reset so you have to start over.
EP from Slayer is VERY messed up, at one point you can get 2, at another you can get 70.
When you "Withdraw All" it closes your bank.
A Cyclops doesn't need to be in the Warrior's Guild to drop defenders, they drop them anywhere.
You're able to make any item stack (PM me for the process of how to do it).
Arrows/bolts don't drop on the ground, they instantly disappear.
There are parts of the map such as Warrior's Guild and Skilling Area where you cannot move at all.
Snakeskin Bandana equips in the weapons slot.
You can bring Summoning monsters into Fight Caves (Jad), allowing you to kill him very easily.
You keep stuff that is WAY less valuable than other items over it (e.g. you keep Dragon Scimitar over Dragon Claws).
If you use a potion in Pest Control, such as strength, and you finish the game, it doesn't restore your stat (in this case strength) back to 99/99, or 67/67, whatever. You stay potted.
All NPCs in the Slayer Tower have horrible GFX bugs and stretch out.
Guthan Chestplate model needs to be fixed, there is an invisible part of the armor on the lower-body.
All scimitars appear to be the old model of an Iron Scimitar.