Lizzie's braid disappears and reappears when in the living room just before her father's death. It's there while speaking to her father, gone when she's in the hall looking back at the living room, then comes back when she discovers the body.
Although at trial investigators testified that neither body showed defensive wounds, Mr. Borden was later shown throwing his hands up near his head as the first axe blows fell, in a way that would make it impossible for his hands and arms to avoid injury.
During the trial it's said that she tried to buy cyanide to kill rodents. In fact, she wanted to buy prussic acid to clean a sealskin cape.
After the murders Lizzie tells Emma that Maplecroft is on the market. Lizzie named the house "Maplecroft" after she moved in.
Lizzie is shown burning the dress in the back yard. In fact, she burned it in the stove.
At the trial Lizzie said she was wearing a white dress with embroidery. When she's being questioned she's seen wearing a colored robe, not a white dress.
Early in the film there are noticeable telephone poles which weren't around during the time period in which the film takes place.
Near the opening of the movie when they are exiting the church you can see a green plastic rubbish container on wheels in the neighboring house yard.
The electric lighting types shown in the early party house would not have been available until around 15 to 20 years later than the 1892 murder.
In the Borden living room there appears to be an Edison Standard cylinder phonograph. This model was not introduced until 1901, some 9 years after the incident.