Audio problem: After the bus crashes to a halt on the courthouse steps, the gunfire stops. A few seconds later, a bullet hole opens up on the side of the bus - but there is no sound.
Audio problem: The section of sound effects used as the Trans-Am and the big-rig pull up to the warehouse to get the beer is exactly the same 'loop' as the effects used when the Trans-Am and the big-rig stop by the pond to give 'Fred' his burgers for lunch. Specifically, the Trans-Am's engine idling down to a stop, then the T/A's door closing, then the big-rig's air brakes squealing a very distinctive sound and finally the big-rig's engine rattling to a stop. Exact same 'loop' both times.
Audio problem: In the initial narration, just after the voiceover mentions the gods and "protect men from their own weakness" you can see the singer moving his mouth without any voice being heard, and in the next shot the flute player peeking at the camera laughing to himself instead of playing - but the sound we hear is just perfect anyway. (00:02:00)
Audio problem: In a wide view of the mice singing "Rescue Aid Society" at the United Nations, a mouse is hitting his drum with a drumstick, but no sounds are coming out of it.