Factual error: There are several scenes in a field of barley. Tramlines are seen. Tramlines in crops were invented in 1975 to allow tractors and sprayers to drive up and down fields. Sunset Song is set around 1914, 61 years before tramlines were invented.
Factual error: The movie is set in the late 90s but in the parking lot scenes, the pair are surrounded by cars as new as 2012.
Continuity mistake: At the beginning while Laing goes to the pool area he says hi to the pregnant woman in the water, and there is a girl beside her who switches side from shot to shot. (00:15:30)
Audio problem: Davis is eating dinner with Julia's parents, and her father is talking about grief. Davis goes to ask Julia's mother something, but his mouth doesn't move. She answers, the scene changes again, and the shot is over the right of her shoulder. Her mouth isn't moving now.