Arcade versionG-Loc's main gimmick was that in the arcade version, you could find it in the so-called R360 cabinet variant, which placed the player in a hydraulic seat that was actually capable of making 360 turns and placing the player upside-down. Complete with safety bars and an "eject" button for the wusses that would immediately straighten the cabinet, the R360 even had a "demo" mode for people that just wanted to experience an amusement ride instead of actually playing the game.
Cover artUS/Europe Cover of the Game Gear version of G-Loc has a picture of F-16 Fighting Falcon in its cover. In the game however you pilot an F-14 Tomcat. An example of many cover-game inconsistencies during that time...
Information also contributed by Rad Spencer