Contradictions

Throughout some episodes of the Big Bang Theory, there are some contradictions, and  here are some as follows;


 * Rajesh is a Hindu, however it can be seen that on his arm he wears a sliver bangle that only Sikhs wear.
 * Although Rajesh cannot talk aroud women, when Howard is gone, he says 'Oh sure, cut the foreigner in half, there's a billion more where he came from,'. However, Penny is in the room.
 * Sheldon knows how to use the phrase ' Oh Snap,' however later on he seems not to understand what it means.