Mary doesn't appear to be wearing her fake pregnancy belly during the burial scene.
Caroline's parents deaths are wrong. Frederick Holbrook died first in 1874 and Charlotte died 10 yrs later in 1884.
A wooden clipboard is used to hold Grandpa's papers, but the clipboard was not invented until 1908.
At 41:25, Albert calls Mrs. Olson Miss Oleson.
Mary's close up at 46:00 shows that she or someone has finally stopped overplucking her eyebrows.
If Caroline's father is from Wisconsin, then the actor portraying him should have ditched the New York accent.