I feel you. As New Zealander watching lord of the rings with local soap opera actors appearing randomly really break whatever immersion you tried to build up...
Sometimes, this happens to me just because the same actor pops up in two films. I can never quite get over Lord Elrond being Mr. Smith from the Matrix, for example. Perhaps because the acting in the two roles seems so similar to me. I don’t watch movies very much. People who do, must have this happening to them all the time.