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.
Other mistake: When Cloud Dancing and Daniel walk a wounded Sully to a clearing, we see a road with what looks like flattened black tents on either side, and Cloud Dancing tells them the Army must have attacked it; that's what is left of a reservation. When it's a modern transport road for everyday access, very poorly disguised as a reservation camp.
The Tempest - S5-E10
Other mistake: After getting the horses inside the barn, Mike sees the twister and hurries inside the homestead to grab Katie and take cover under the staircase. When Sully and Brian arrive the next morning to find debris littering the house, they call out for Mike, and she comes rushing down the stairs holding Katie, instead of coming out from the staircase where they were safe.
Suggested correction: By morning, the tornado has already hit and its threat is long passed, so there was absolutely no reason for Michaela and Katie to have remained hiding under the staircase. Prior to that scene, Sully and Brian were on their way back home, and when they took refuge from the twister, they released their four horses to instinctively find their own safe place. After the tornado passed, once it was safe to ride again, Brian and Sully needed to first find all their horses, and then continued riding back home. As you said yourself, "Sully and Brian arrive the next morning."
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.
Other mistake: Toward the end, when Mike is snuggling at the window with Sully, the candle on the wall near them isn't lit. But there is ominous light about them, obviously from the studio set.
The Tempest - S5-E10
Other mistake: Smoke from the burning Thanksgiving dinner starts wafting from the stove just moments before a strong wind from a coming storm blasts through the window. Yet somehow Michaela doesn't notice the smell just moments before going outside with Katie.
Other mistake: When Sully's wrist gets scraped while moving the examining bed off the wagon, Dr. Mike merely dabs over it with some disinfectant, instead of thoroughly cleansing the wound with a wet cloth before suturing like a normal doctor.
Dr. Quinn, Medicine Woman - S1-E1
Other mistake: When Emily is in crisis labor Dr. Mike sedates her and does a C section delivery. But Emily periodically regains consciousness during and after. Never once reacting to any pain from the cutting, which seems unlikely.
When a Child is Born (2) - S4-E28
Other mistake: Not to sound rude, but Jane (Seymour) was literally pregnant, in labor when her water broke, but no visible staining on her gown or on the wagon seat when Sully pulls her up.
