Raj and Howard discuss if either of them know any lawyers, and subsequently argue over Jewish and Indian stereotypes. It is never mentioned about Raj's sister Priya, seen earlier on the series, being a lawyer.
When Sheldon states that the German for 'know-it-all' is 'Besserwisser' he pronounces it as if it were an English word. However, in German 'w' is pronounced like the English 'v', so he should have pronounced it 'besser-visser'.