Continuity mistake: Legionnaires are being mowed down left and right by enemy fire in a Nazi ambush. One of them falls into a road construction excavation. He falls on his back, but the close-up of his feet touching the power cable shows them facing down.
Continuity mistake: Whilst the family are on their way to the parents' house, Inoue takes out a sandwich in his mouth to show to a driver in the car beside him. After he takes the sandwich out of his mouth, the sandwich and the hand he is holding it in, rotate 90° in between shots. (00:17:13)
Continuity mistake: The social worker takes "the brother" to stay for a while at a female friend's place. Her son, "little Earl" has a bandage on his left knee. He peels the bandage off and sets it on the floor to show "the brother alien" his injury. A medium shot shows there is no bandage on the floor. The "alien" puts his hand on the boy's knee, and heals it. The very next shot the bandage is back on the boy's knee and the scene continues.