Contradiction with Matthew 8:28
It mentions two demon-possessed men meeting Jesus, while Luke 8:26-27 refers to one.
Matthew 8:28: And when he was come to the other side into the country of the Gergesenes, there met him two possessed with devils, coming out of the tombs, exceeding fierce, so that no man might pass by that way.
Contradiction with Mark 5:2
Similar to Luke 8:26 but located in the country of the Gadarenes; some translations suggest the Gergesenes in Luke.
Mark 5:2: And when he was come out of the ship, immediately there met him out of the tombs a man with an unclean spirit,