Audio problem: When Axel first reunites with Serge, Serge greets him with a kiss on each cheek. Problem is, we can hear the smooch on each cheek, but Serge is speaking at the same time, and he does not pause his speech for the smooch.
Audio problem: During the final battle, when Sean and Crane start fighting with their arm-blades, listen closely. There's just a few too many "blade clashing" sound effects added in, and it doesn't always perfectly match up to what's on-screen. More were obviously added in to make it seem more dramatic, but it doesn't quite seem "right" if you pay close attention.
Audio problem: When Tristan returns the second time he is driving horses along, shouting loudly, but without moving his mouth. (01:19:35)
Audio problem: When they arrive in church and Scotty sits down with his dad, his dad's lips move to say something but nothing comes out. (00:53:10)
Audio problem: When Farley traps The Shadow in the water tank, he declares that "I'm going to be a king! A king!" He says the second "A king!" without moving his mouth.