Braveheart was a popular film on Earth.
In 2003, when Teal'c mentioned that the Celts were formidable warriors in their time, Colonel Jack O'Neill said that he had seen Braveheart too often. (SG1: "Forsaken")
In 2005, Dr. Rodney McKay compared the prisoners of Olesia to the cast of Braveheart. (SGA: "Condemned")