Audio problem: When Colombo pulls out Bond's gun it makes a noise like the top is pulled back. But he takes it out with one hand, and the hammer has not been pulled back. Even if he pulled back the hammer with a finger (which he doesn't) it wouldn't make that sound.
Audio problem: When Bond is being shot at while motor-boating away from his pursuers in Venice, at one point during the chase, they shoot right next to a rope on his boat and a sound from a silenced handgun is heard when the bullet hits the wood. No one is using a silenced handgun.
Audio problem: When Bond takes the 'belt' off his tux, in order to get the concealed rope, there is a scratching sound, as velcro ripping. But the belt is not closed with velcro. We can see metal clamps when the belt lies on the ground and Bond removes the rope.