Forbidden Planet (1956) - 10 mistakes

Plot hole: Krell doorways and equipment suggest they are short, wide and 2-3 times larger than a human. Yet the shuttle pod the Commander, Doctor and Morbius ride in is designed for human size beings.

Continuity: During the alien's assault on the ship, one crewman is seen near the spaceship's stairs firing a weapon. However, the weapon is pointed at a forty-five to sixty degree angle - at this angle, he would hit the bottom of the ship, not the alien that is much farther out.

Continuity: While Adams is wearing the plastic educator machine's sensors on his forehead, he reaches for the creation lever. Morbius stops him and the sensors are suddenly retracted from his head.

Plot hole: Morbius says no physical representation of the Krell remains. Yet later he shows the Commander a screen that contains the total sum of the Krell's scientific knowledge. So didn't the Krell study their own biology?

Factual error: At the end of the movie the cast is counting down to the explosion of the Krell furnaces. They reach zero and the furnaces explode. They see the light from the explosion just it happens. But they are 100 million miles out by then. The light would have taken over 8 minutes, about as long as light from the sun takes to reach earth, to reach the ship.

Revealing: When Robby brings Doc Ostro in the Residence front room to lay him on the couch, you can see a number of the very thin black cables supporting the live actor playing Doc Ostro. Later, when Robby carries the 'body' out, it's quite obviously a mannequin due to the unnatural angle of the head. A dead person's head would sag against the robot's arm - this one is sticking straight out. The Robby suit was not only quite expensive for its day, but very noisy; requiring external power. As Robby is taking Doc Ostro's body out to the vehicle, Adams attempts to figure out the ID mystery. As he confronts Morbius, Robby walks back into the residence. If you look at his right leg, you can see the power cable trailing right behind.

Continuity: As Adams chews out the guards for allowing the alien onto the ship, he is fiddling with a pen. Cut to a closeup and the pen is on the table.

Visible crew/equipment: When the space visitors land on the planet and Robbie the Robot comes to meet them, you can see the reflection of a load of studio lights in the plastic visors of the vehicle Robbie is driving.

Other: When the Id creature is melting through the door and Morbius is denying he subconsciously created it, the Commander draws his blaster giving the impression he will kill Morbius to save them if necessary. But Robby deactivated the blaster just a few scenes prior. Was he going to beat Morbius to death with it?

Continuity: When Robby is aiming the blaster at Adams, Morbius tells him to aim between the eyes. In the shot on Adams, the tip of the blaster can be seen rising at the edge of the screen, but Robby is too far away for that to be possible.