Continuity: When Snake comes out of the sewer, right before the tidal wave/surf scene, his hair is dry, but it would have been wet from being fully submersed in the water, which you can also plainly see in the previous scene where he's shot in the leg.
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Mistakes
The hang gliding scene couldn't work because there is no way these people could fly these things. Flying a professionally designed glider takes several hours of training, yet these people manage to fly these home-made ones with great ease. See more...
Escape From L.A. (1996)
Directed by John Carpenter, starring Kurt Russell, Pam Grier, Peter Fonda, Steve Buscemi, Valeria Golino (add more)
Escape From L.A. mistakes
Other: As Plisken escapes in the hijacked chopper, Quervo Jones picks up a bazooka and prepares to fire on it. As Fast Eddy shoots him through the chest, watch the bazooka. You can see right through the barrel. In other words, there is no ammo in the weapon.
Continuity: In the scene where Snake "surfs" onto the Caddy right before Eddy stops the car you see that the left taillight lens is broken (bright white light). But after Snake gets in the driver's seat and takes off the light is red again.