Critics and publicity writers frequently played on the film's "High Road To China" title by incorporating the witticism "The Low Road To..." in articles and reviews.
Second assistant director Chris Carreras and lead actress Bess Armstrong met whilst working on the movie. The pair started a personal relationship which lead to a marriage before the two were divorced in 1984. Publicity for the picture reported how Armstrong fell in love during the production shoot, both on the set in real life with the 2nd A.D. and on the set in the movie's story, her Eve character falling in love with Tom Selleck's Patrick character.
In the scene where they escape from the Arab camp, a young Arab man claims he will kill himself if she leaves. Eve screams... well, originally it was just "Men!" and he lips clearly say more. But the sound is blanked out. Otherwise, I guess it would have been a 15!
In the climactic battle scene, a number of the Chinese peasants can be seen using Mauser 98k rifles, a variant of the 1898 Mauser which wasn't introduced until 1935, at least a decade after this film is set.
When Eve Tozer tells Charlie Shane that she couldn't live without money after he told her that her father should be declared dead, she smokes a cigarette. In the next cut the cigarette is gone.