When the identity of the hip bone is discovered, Zack says William had died two years ago of cancer. When Booth is talking to William's parents, he says William was buried three years ago.
When Booth and Bones are in the car, she looks at the window but in the next scene she is looking at Booth.
Li Ling Fan's "fiancée visa" is issued by China, but a real fiancée visa for a Chinese citizen would be issued by the US consulate in Guangzhou. The top part looks like a visa from the Chinese government (issued to US citizens to enter China), even being issued in New York. It's also listed as an L visa, but a US fiancée visa is a K-1. The bottom lines of letters and numbers look like an actual US visa, though.
Sailboats do indeed have keys, an ignition, a companionway hatch and a foredeck hatch.
Bones claims she does not understand Chinese, yet a few scenes later she is speaking Chinese. It is common for people to know a few sayings in a language but not be able to speak it fluently, and with Bones's many world travels, it's not surprising she would have picked up some basic understanding of various foreign languages.
As the camera rolls towards Sully, Booth and Brennan talking in the lab about the Flying Horse sword, a trolley with various lab equipment is visibly rolled out of the way in the bottom left hand corner of the picture to make way for the camera.
When Sully is leaving on his boat at the end, if you look closely on the right side of the boat a hand appears and later when they flash back to him you can see a head appear on the boat, yet Sully is the only person on the boat.