When Bobby and Stig cross into Texas from Mexico, they walk through the Rio Grande which flows from their right to their left. But the Rio Grande flows east along that border, so it should be left to right when they walk north. As depicted, they're going the wrong way.
The bait shop where Stig stores his weapons and he and Bobby meet up after escaping NAS Corpus Christi is obviously not in Texas. It is against Texas Alcoholic Beverage Commission law to have neon beer signs on exterior windows.
Bobby tells Stig that his sniper rifle is a military version even though Bobby is across the street, at night and with Stig partially hidden behind a roof ridge. Bobby could not possibly tell what version of rifle Stig has under these conditions.