I experienced a lovely glitch this morning in the middle of a mission that meant I couldn't complete it. Climbed up to ride shotgun on a cart, the horses started walking but the cart never moved, so we're glued to the spot forever. Awesome.
Where was the QA team for this game? I want their names so we can make sure they never work again (although it feels like that wouldn't be too much of a change for them)!