I have unloaded the entire contents of a clip into the legs of a single enemy, only to have him hop for a minute before resuming fire unhindered. Roll and dive animations activated by the AI can also be buggy. There are times when the animation seems to render a soldier invulnerable, making any shots fired against the moving figure ineffective until the sequence is completed. In tense situations where every reflex shot counts, this can be frustrating and costly. There are also consistent problems with clipping and collision detection.
Gun barrels poke through closed doors, revealing hidden enemies.
Bodies fall into walls, leaving only legs visible. In one instance an enemy soldier became stuck between polygons of a truck, making him impervious to bullets. The only way past him was to reload a savegame, which while frustrating in itself was rendered doubly so by another much worse problem. The release version of SoF contains a particularly bad reload bug. The error is actually a problem with CD authentication and WON multiplayer code which doesn't recognise the CD in the drive.