Lianne Spiderbaby, actress and girlfriend of Quentin Tarantino was considered for a role in Southwest, however due to scheduling it fell through.
The boonie hat used in the combat scene and military base scene is the same hat that director Shawn Lecrone used as wardrobe in his extra role in Transformers.
Paul Bradford (Federal Agent Wessen), Scott Tepperman (Federal Agent Smith) and Barry Fitzgerald (Irish Mick) were the stars of Syfy channel's Ghost Hunters International.