Revealing mistake: When Cross and Kane are investigating the crime scene at the Asian woman's house, there are numerous candles burning in the woman's bedroom. The woman lit these candles at night, and Cross and Kane are conducting the investigation in daylight, which means all of the candles should have been burning for numerous hours. However, all of the candles are brand new and from the shape of them you can see they haven't been burning for more than a few minutes at most.
Revealing mistake: When Picasso removes the first finger from Fan Yau Lee's hand, you can see that there is no blood on the instrument used.