I'll start with something obvious and probably just incomplete: Power armour. It gives the soldiers funny purple pyramid shaped hats, the walk animation is awkward/glitchy, and bolt rifles seem to protrude from the soldiers' foreheads.
http://hem.bredband.net/b300661/funnyhat.jpghttp://hem.bredband.net/b300661/funnyhat2.jpgSecondly... the camera has gone glitchy, usually when its not your turn, it's very jerky and often scrolls away from the action. It's especially bad during grenade throws(player turn), it scrolls far away from the grenade toss pretty much every time(cameraman afraid of grenades?).
Thirdly, weapons and equipment on my interceptors randomly vanish into thin air, often leaving me with no eligable interceptors when a UFO arrives, because none of them have any weapons equiped. I have no clue what causes this, could be anything from doing a mission, to completing a science project, to it changing to a new month.
And fourth, least serious and mainly just a laugh, figured I'd share, get a load of this picture:
http://hem.bredband.net/b300661/sniperplane.jpgOh and I managed to get a soldier with the rather uhm... revealing name: Fancy Bush.