When Kyra is talking to Jake whilst he is eating food in the restaurant she puts her pencil down on top of her book and pushes the pencil and the book to one side. However, when she returns with her food the book is back in the middle of the table and the pencil is positioned away from the book. The pencil also moves positions in between scenes.
The camera that Yang uses to take the family portrait is a Pentax K1000, a common SLR film camera. The film shows Yang setting a self-timer (you can hear it buzzing) but the Pentax K1000 has no self-timer function.