An Officer and a Gentleman (1982) - 8 mistakes
Continuity: When Richard Gere is fighting with his drill instructor, red marks on his stomach and back (from being hit) disappear and reappear with each shot. Submitted by EmilyGrace
Visible crew/equipment: Near the beginning when the new recruits have arrived & are being harangued by the drill sergeant for the first time, in the shot where he walks along the line of recruits towards the camera you can see the camera dolly tracks on the grass. Then when the angle changes to a long shot you can see the marks left in the grass by the tracks.
Continuity: During the graduation sequence, one of the officer candidates salutes the Commanding Officer with his sword. A split second later, we see the officer candidate from behind and the sword is miraculously returned to its scabbard, a motion that anyone who has performed it will tell you takes at least five to ten seconds.