Here are 2 mistakes I've found on 'Bouncers'
1) In the scene where Matthew says 'You've finished? I don't think you have.' You can see a microphone at the top of the screen. 0:01:42.
It is visible again at 0:02:45 when Matthew says 'Trains and tunnels.'
2) When Matthew is giving Sweep some runner beans using 'Trains and tunnels'. At 0:03:08, look at Sweep's mouth and you can clearly see the spoon dosen't touch his mouth.