Spoiler:After obtaining the Regalia Type-F and taking off for the first time, Noctis will say to Ignis "Where we're going, we don't need roads.". This is a reference to Back to The Future, specifically a line said by Doctor Emmett Brown.
Contributed by ProtoSnake
One of the influences for the game's world was the 1989 film Back to the Future Part II. Lead designer for the game, Wan Hazmer, liked how at the beginning of the film, Marty McFly is surprised by the future world, but how the people there of that time react normal to it. This idea was used for how to provide the player with this "culture shock" of fantasy, but at the same make it realistic.
Contributed by KnowledgeBase