Samuel places one straw in the milkshake. After the cut there are two.
While Hiro is on trial, Ando asks him if he used his power to save his father from being murdered and Hiro says that he didn't. He did in fact travel back in time to save his father, but his father rejected Hiro's help.
(at around 28 mins) When Sylar says "Listen, I know you must hate me", the boom microphone is visible on the top left of the screen right before it cuts to Claire.