Plot hole: "The noise" is supposed to sound whenever anyone starts using machinery, but in this episode the tugboat's engine doesn't trigger the noise until it reaches the estuary in the next episode - the noise should have started the moment Jonathan started the engine.
Visible crew/equipment: When Jonathan and Nicky are in the cabin of the tugboat sailing on the canal in the scene leading up to the jammed bridge, you can see reflections of crew members in the rear window of the cabin.
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