1. A Throw Away Quip Tells You Who Stole The Truck - The Usual Suspects
The plot of The Usual Suspects is kicked into motion by a truck full of gun parts being hijacked outside of Queens. Between the usual suspects (aha) being brought in (meaning the cops have no idea) and the plot moving so briskly ahead the identity of the hijacker becomes so unimportant that by the time the reveal of who did it rolls around (it was Todd Hockney and the truck owner was one Keyser Soze) the audience can be forgiven for not being too bothered (or even noticing it at all).
Those on the lookout for sly references (and not totally focused on the twist) however may have been able to figure this out way back at the beginning. A gloriously cocky line from Agent Kujan early on has him proclaim he has a foolproof way to tell whos the guilty man in a room of felons; its whoevers sleeping, resting as they know theyre caught.
And when the gang are in the cell who's the only man laying down catching a short nap; Hockney. An unbelievably intricate detail, this is another hidden gem in Christopher McQuarries deeply layered screenplay.
Are there any other films with deeply hidden foreshadowings? Which of these hadn't you come across before? Head down to the unforeshadowed comments section and have your say.