When Jack and Tom get physically thrown out of the bar, they make full body contact with the wet, dirty, leaf-strewn street. Yet when they stand up to speak with the Thatcher sisters, both of them have spotlessly clean/dry coats and clothes.
When Clara and Abigail are talking, Clara's hair changes between shots.
Viola Thatcher is disdainful of Jack for not knowing what Peach Melba is, and she informs him haughtily that it is: "ice cream, with peach sauce". But Peach Melba is actually ice cream, peaches, and raspberry sauce.
Chicken fried steak is always served with gravy.
There are times throughout the series when it appears that the writers, located in Hollywood, U.S.A., forget in what country the show is taking place. An example is revealed when the defense attorney attempts to bribe the judge. The Judge says "I'm sure you're aware that bribing a judge is a Federal offense." That is what an American judge would say, but Canada at that time was a Commonwealth. The judge should be saying something like "I'm sure you're aware that bribing a judge is a crime against the crown."
There is no pipe running up to or down from the town's water tank.
Most women during this time period wore their hair up in a bun and always wore a hat in public places. Clothing was modest with dresses/blouses with high necklines. Also most women of good rapport never wore makeup. The second season of the show drifted from these social norms.
Absolutely nothing about the women's long wavy hair styles is correct for 1910.