Corrected entry: Thai is a tonal language, which means that each syllable must be stressed in a specific way in order for the word to make sense. In the scene where Richard demonstrates his knowledge of Thai, several people repeat the same sentence, but each person stresses it differently. Only one person actually gets it right.
Corrected entry: When Richard goes back to the community after his brief stay in the jungle, Francoise acts as if she has never seen him before in her life. Why? It's not as if he was gone for decades and suddenly re-appeared out of the blue. And it's not as if he made some radical physical transformation. In fact he looks exactly the same as he did on the day he was first sent to the jungle, clean-shaven and a perfect haircut.