Continuity mistake: The gown Gilda S. Claire wears at her open concert is not the same one Emma made for her in the Mercantile.
The Comfort of Friends - S6-E4
Continuity mistake: When Michaela enters the homestead after handing Katie off to Matthew, it immediately cuts to her in the master bedroom upstairs, pouring water into the bowl to splash on her face, as she suffers another pregnancy attack when she wouldn't have been able to manage climbing the stairs in her delicate condition.
Wave Goodbye - S6-E5
Plot hole: Dr. Mike and Daniel are discussing whether Princess Nizamoff is a fake or not, considering all the voices from the dead she performed during the séance. Yet Mike totally forgets that Mizamoff addressed her former medical professor in grave detail. Something the Princess would not have known otherwise.
Factual error: Marjorie's tragic death: The Quinn family has her funeral in the town cemetery, where she did not belong, instead honoring her death with a vigil, then transporting her body back to Boston, to be buried properly with her Quinn relatives: A common respect reserved for dignitaries; which technically the Quinn family was/is, and soldiers.
Plot hole: In the ending scene, Mike has a probable concussion from her fall, so Sully keeps her awake to prevent her slipping into a coma. They talk all night, reminiscing as Mike experiences periodic pain spasms. Their talk ends with discussion over them having another child, and then they instantly engage in an intimate moment, which would be impossible, considering her condition, and without further checkup from another doctor. Sometime later she is suddenly feeling 'cured', and they return home.
Answer: A Cooper was someone who made various things out of wood including wooden caskets and even barrels.