Plot hole: The captain's wife tells him that she's taking his daughter with her, not giving him a chance to even say goodbye. During the episode it turns out that she's angry because he missed lunch with them, and when the Metal Wu texts the boss, it also turns out that all this just happens at 1:11 AM! It does not make much sense: she waited over 12 hours to complain to her husband, and she's driving her kid in the middle of the night.
Continuity mistake: In one shot (the one where the racist waitress slowly puts her hands on her hips), the sausage platter is turned differently than in the rest of the scene. The same mistake pops back later when father and son are confronted by the couple of white knights. (00:18:10)
Continuity mistake: Kai's knife, once he inflicts the deadly stab, bears just a single streak of blood in one shot, and appears soaked in it in the following. And in the overhead shot immediately following him pulling out, the knife is missing from his hand entirely. (00:45:00)
Continuity mistake: Christine's timeline starts "12 hours ago", so around noon, and it is taken from the ending of episode 1x06: Gu Assassins. But that scene happened early in the morning (Kai takes off for his trip, and after seeing them together, Zan goes to Alec, being even greeted with "Good morning Zan, you're up early").
Plot hole: Unable to locate "the bald chef", Uncle Six orders his men to bring him all the bald chefs of Chinatown. And they do! His goons round them all up, in a single sweep. They fit in a little van. So...in the whole San Francisco Chinatown, over 30,000 inhabitants, there are only literally a dozen bald (or balding or shaven, when you look at who they got) guys working in a kitchen.
Continuity mistake: When we see the outcome of the fight between Jenny and Zan, Zan's very last move is a low spinning sweep kick. When Jenny lands, we see she has a cut above her left eyebrow, but nothing particularly significant. However in her next shot she's a crimson mask with that wound wider, blood that gushed down that cheek. (00:34:40)
Continuity mistake: Lu Xin is downstairs playing with his lighter. The first shot ends with the lighter held still with the decorated side towards him, while the following one has the the solid gold side face him. Moreover, when Jenny sits down he goes from having both hands on the lighter, to one hand on his bicep. (00:18:30)
Revealing mistake: When the protagonist and Uncle Six battle on top of the escalator, Six gets thrown off, landing downstairs. Very much like a pro wrestling Irish whip, it's quite noticeable how the victim is running towards the move before he gets pulled, with a cut to try to hide the lack of any push from the other hand or forceful twist. (00:12:15)