this video explains best what terrible issues the arma UI system has. solution also presented at the end of the video. thx to Dslyecxi for this demonstration video: http://www.youtube.com/watch?v=I-Ve4PJQhjY
a good example of this happening in dayz s.a. would be opening/closing the doors in hospital or other multi-storage buildings in which you open a door a level below where you actually are or through walls etc. the issue will also affect vehicles once they roll out.
this is definitely something that should be fixed in dayz and for sure in future arma releases.