No, it doesn't...tis why I made a point of stating that the character's effective HD is the higher of the two. If you were a 5th level barb, and 3rd level in a prestige, your just a 5th level character for level based events. Btw, I only just noticed my failure to state that there is one extra feat for all races at first level (balance issue that pops up at around lv 7 if I dont include it)