The Library - S3-E5
Other mistake: Dr. Mike spots a charred Bible within the charred piles of books, and heads into the church. The Reverend is giving a sermon on morality, and offers Dr. Mike the floor and she briefs about certain stories in the book, which would be considered scandalous, without mentioning the book's title, then hands it to the Reverend who agrees such stories are scandalous, until he turns it over, to see that its 'The Holy Bible'. Being a Reverend, he should know The Bible cover to cover, but reacts surprised or shocked over the mentioning of the scandalous stories. (00:36:00 - 00:41:00)
Other mistake: In the scene where Dorothy decides to join the church picnic (just before her operation) Grace is talking to her and hands her a glass of cider as Robert E. approaches. The sky is partly cloudy, but the lighting changes slightly during the shot, and at one moment, appears too bright on Dorothy just before she sets the glass down and walks away.
For Better or Worse (2) - S3-E29
Other mistake: When Loren confronts Elizabeth about giving Dr. Mike away, he states he's lived for 10 years with the guilt of not giving his late daughter Abagail away in marriage to Sully. But it would in fact have been only 4 years, given Sully's marriage to Abagail was 1.5 years before their pregnancy, labour, and death, followed by Dr. Mike's arrival a year later, to their current wedding day.
For Better or Worse (2) - S3-E29
Other mistake: Cloud Dancing gives Sully his white Cheyenne tribal dress to wear as a wedding suit, but Sully pulls on a very different deerskin coat inside the barbershop.
Answer: A Cooper was someone who made various things out of wood including wooden caskets and even barrels.