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Abagail's grave marker has her birth year as 1839 so she and Sully would have married in 1857(Sully said she was 18 when she got married). In the pilot, however, Charlotte Cooper says Sully came to Colorado in the Pike's Peak Rush in 1859. In the "Running Ghost" episode, Loren says Abagail grew up in the store so she couldn't have married Sully before he came to Colorado.
In this episode Matthew introduces himself to Ingrid, however in two of the previous episodes Matthew interacted with Ingrid. Once inviting her to dinner, and even committed a crime with her brother.
After Matthew sets the table, waiting for the soldiers to knock on the door looking for renegades, there is nothing but plates and cups. In the next scene, we can see bread.
Vehicles in 1867? In the scene where Charlotte and the kids drive Michaela back to her homestead, if you look above Charlotte's hat, you can see a white van driving to the left in the background.
Colm Meaney was Miles Edward O'Brien on both Star Trek: The Next Generation and Star Trek: Deep Space Nine.