When Mr. Wong removes the dart from the neck of Princess Lin Hwa, it can be seen that there is a residue that covers approximately 1/3 of the tip of the dart. In the next scene, upon examining the same dart under a magnifying glass, no trace of the residue is seen.
When Mr. Wong first visits Mr. Davison he is given a drink while sitting on the couch. He takes a drink then sits it down on the table in front of him. He's shown with his arms at his sides, then the angle changes and he is holding the drink in one hand, then it changes again and the drink is gone and he stands up to leave.
When Street and Logan arrive at Davidson's house, the supposedly-dead dogs are clearly breathing as Street kneels to examine them.
When Wong and Street leave Wong's house they tell Bobbie their next stop is the deceased Princess's apartment, then they proceed to visit the ship she arrived on.