Mrs Bennet prepares a basket of food to take to Lady de Bourgh, and mentions she is bringing Loganberries. Loganberries are a cross accidentally created in California in 1883. Most Austen stories takes place in the late 1700s, early 1800s.
There is a passing reference to Loganberry jam. Loganberries were not developed until 1883, seventy years after the novel's publication.