Some viewers have questioned the family's changing accents from one scene to another, believing it was a continuity error due to the actors making mistakes and coming out of character. If you pay attention, you will realize they only speak in a British accent when speaking privately with one another and in an American accent around their guests and strangers. They tell everyone that they are locals of the area and have lived there their whole lives. Later, it's revealed they are actually much older than anyone could guess, suggesting they are not really from that town. The accent switching is meant to clue the audience in that they are not at all who they claim to be.
When Cameron leaves the gas station on his Kawasaki the soundtrack is of a big V-twin not that of a Japanese 4 cylinder motorcycle.