The marine who discovers the body at the beginning of the episode discovers a skull and wet suit. The body Ducky examines still has musculature and soft tissue of the face and head.
When Missy claims to have been Miss Biloxi she pronounces it the way NO ONE in the South would. It is pronounced Bilucksy,not Bilocksy. is an Indian word.
Where Tony and Ziva check the contents of the storage locker of the presumed dead diver, the manager of the warehouse hands a key to Ziva; however, in the real world a manager does not have a key to any customer's locker, because such a place includes a concept of u-store-u-lock-u-keep-key.
Abby claims that the diver was using "nitrox" to dive deep in reality nitrox can not be used on deep dives due to the raised oxygen level. It is used for extended down time at mid to shallow depths.
At 01:14- there are hundreds of footprints around the body yet the authorities haven't been notified.