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Chris is in front of and to the left of the camera, which is on Sam as he runs up and they have a 10 second dialogue. Sam then turns round and runs back the way he came, shouting "Annie". The camera tracks to follow him and at the very last moment Chris is forced to jump out of the way to avoid being hit. (If you listen to the audio commentary you can hear the producer laughing about this). See more...
I'm afraid there aren't any mistakes listed for series all.