In some shots during the courtroom scenes, one of the jurors can be seen to be wearing a modern pair of dark-rimmed spectacles.
In the movie Cortez appears to be riding to the border through the Texas Hill Country, traversing high hills covered in cedar with low mountains in the background, and arrives near the Rio Grande in a mountainous area - obviously in West Texas. In reality, Cortez rode south from Karnes County and was captured near El Sauz in Starr County, mostly flat area with very low hills, if any, then known as "the wild horse desert" filled with prickly pear cactus and mesquite - not at all like the countryside depicted in the movie.