This is likely to have been documented before so apologies for duplicate posting if that is the case. I couldn't find any reference to it in the current bug reporting area, and admittedly I haven't checked the old forum.
Map: The battle for Sfakia
Flag point: Upper town
Steps to recreate: I'm not entirely sure 100% (and will test again next time I am on the map) I went up the ladder and along to the sandbags, there I tried to jump over to the next building (from the roof it has a hole that I was intending to drop down and surprise some enemy) I seemed to fall into the wall, I hit jump again to try and propel myself to the gap between the two buildings, but instead ended up inside the first building static model. See secreen shot below. I could not shoot out - i.e. my bullets did no damage to passing Germans, however I could lay in the cap zone on the flag, if I had been a squad leader I'm sure players could have spawned on me - and thus capped the flag.
Perhaps nothing can be done about this, but it reminded me of the BF2 vanilla Karkand wall hack. Once the hack-steps are documented anyone can do it.