In the bar when Walsh and his goons are looking at their passports, the view alternates several times between over-the-shoulder shots and face-on shots of Walsh. In the over-the-shoulder shots Walsh is holding his passport. In the face-on shots Walsh is holding his bottle of beer.
In describing the location of Salvation Mountain (at about 8:40) J. Edgar says it is South of the Salton Sea. Salvation Mountain is east of the Salton Sea.