Audio problem: When Oliver is fighting the guys in the hallway, he shoots the second to last guy. But when he starts to draw an instant beforehand, you can see that his right hand, with which he holds the arrow, is nowhere near the quiver when the sound of the drawn arrow begins.
Audio problem: When Miss Fisher is interrogating Stone and asks him "What's the matter Mr. Stone..." he's gulping down his liquor. She finishes the sentence ("cat got your tongue?") in a separate shot, and the sound of him just putting down the glass is heard. But if you look at the little bit of him that is poking in the foreground, he's puffing smoke instead. Kinda hard to do that with a mouthful of whiskey. (00:31:40)
Audio problem: The mechanical Simplex door locks make electronic bleeping noises when the buttons are pressed. As these are mechanical locks with no electronic components, the most you should hear is a click as each button is pressed.