Besides the 1st person bugs here: http://www.gamesas.com/topic/1440918-1st-person-view-totally-broken-when-sitting/ and the problems with missing left-up arm animation taking a torch when you're riding horses.... I've just reproduced also this bug with the Dragonborn DLC where dead dragon skeleton hit by magic spells like fireballs etc. is essentially weightless (here is an example video from YT. It's not mine): https://www.youtube.com/watch?v=_OIWOnpZd0c
All mentioned bugs are 100% reproducible on the vanilla PC game.

Hope this topic can help Bethesda team to fix these minor bugs with a future update.... a sort of notify for the game developers.
Tested on the PC Steam version. Skyrim 1.8.151.0.7.