During early scenes when the recruits are being marched around the base take a look at the road markings - they are clearly UK and not US markings.
Private pyle's position in the barracks bunk line moves during the verbal abuse scene at the start of the film
It seems that when Hartman punches joker in the gut that he starts to hit him with his left fist, but when the scene changes to the hit, it is with his right fist.
Ask any Marine, it's IMPOSSIBLE to get live or spent ammunition off of a firing range. All brass is counted and if there is a discrepancy the platoon is not allowed to leave the range until ALL rounds are accounted for. Therefore, the killing of Hartman in the head by Pyle could never happen. All Marines I know love the movie but laugh about that scene.
When GySgt Hartman goes to punch Joker for impersonating John Wayne, he begins to use his left but as the scene switches to a different angle, Joker gets hit with Gunny's right (in Joker's left side).
When Joker and Raptor are flying in the helicopter, the scene briefly shows the shadow of the helicopter on the trees below. The shadow is clearly of a helicopter in the shape of a Hughes OH, rather than a Sikorsky body shape. The movie then cuts to the Sikorsky and the shooting at peasants on the ground takes place.
Seen a blooper in Full Metal Jacket?
Use our simple iRewind system to add a new movie mistake
to this page in just a few clicks.