When Nikki is watching Melinda sleep she is curled up with a doll. A few scenes later you see Tessa give Melinda the same doll she had been sleeping with.
In the fight on the "Sea Witch 2" Alexi accidentally rucks the carpet he and Duncan are fighting on, the shot changes and Duncan punches Alexi over a chair, the shot changes back to the former view and the carpet has been smoothed out again.
The Cyrillic lettering on the Russian ship doesn't actually mean anything. Obvious ignorance of Russian navy ordinances.
Richie witnesses the scene in which drugs are put in Nikki's bag, but later he is surprised when she takes them out. How could he have forgotten about the drugs?