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Forbidden Planet (1956) Poster

Goofs

Audio/visual unsynchronised 

Just before they land, Adams impatiently flips off the radio as Morbius is in the middle of the word "recommend". Morbius should have been cut off immediately and in mid-word. But we hear him say the full word "recommend" even after Adams has shut the radio off.

Character error 

While the three men are standing on the walkway in the Krell machine, Morbius points to his right and says "Twenty miles". He then points to his left and says "Twenty miles". Since the three would then seem to be in the center of the machine, that would make it forty miles in total width, yet in the in the second scene following, he states "Yes, a single machine. A cube twenty miles on a side.". If it is indeed a cube, as Morbius indicates, the Krell machine shrunk from 64,000 cubic miles to 8,000 cubic miles in a little less than half a minute - Quite an error for a scientist with an expanded mental capacity to make.
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Continuity 

Dr. Morbius invites Commander Adams to try his blaster on the Krell metal door. Cmdr. Adams inspects the result after firing, but he's not touching the spot where the beam hit the door.
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During the kissing lesson, Jerry goes from embracing Altaira to holding her by the arms between shots.
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The sudden appearance of the cook behind the officers after Robby the Robot first arrives at the ship and his subsequent position relative to them before they leave with Robby.
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As Altaira talks to the commander after being found kissing Lieutenant Farman, her position changes from being side-on to face-on to the commander.
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Crew or equipment visible 

As the vehicle driven by the robot first drives up to the residence, there is a tow cable visible in the foreground, partially obscured by the bushes. This cable is most visible behind the vehicle as it leaves the scene.
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When the Monster is burning/melting the metal door, as it turns white hot and lumps start to fall, you can see a member of the crew in a heatproof suit prodding the material from behind to make it fall. Watch the second and third holes for movement behind the door. Then again, this motion could be taken to be the monster doing the poking...
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When Commander Adams leaves Lt. Ostrow to go outside the living quarters to see Altaira in the swimming pool, we hear a film crew member cough.
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When Robby the Robot carries the Doc out of the study after the latter has taking the brain boost, wires can be seen suspending the Doc from the ceiling. The actor inside the cumbersome robot costume was obviously not able to support the Doc's weight.
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During the landing scene, the shadow of the ship (or a supporting structure of the suspended model) is visible briefly moving across one of the smaller mountains at the right side of the screen.
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When Robby the Robot uses the blaster on the plant in the garden, an unidentifiable shadow suddenly appears on the green V support directly behind Commander Adams.
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Factual errors 

The intro to the movie sets the timeline as "late in the 21st century" moving on to the year 2200. In fact, the 21st century comprises the years 2001 to 2100.
The star Altair is shown as an orange-red star, eclipsed by one of its (spherical) planets. It is now known that Altair is white and is oblate, with its equatorial diameter 14% greater than its polar diameter, something that was not known when the movie was produced.
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Robby the Robot shows up carrying lead shielding, which he says is "isotope 217", and he implies it is lighter than ordinary lead. The purported isotope lead-217 does not exist, and if it did, it would be 4% heavier than the most common (and heaviest) isotope of lead (number 208), not lighter.
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Plot holes 

The monster leaves a flat footprint, yet the cast of the footprint shows a huge curving claw and other three dimensional structures that could not possibly have been gleaned from the outline of a flat footprint.

Revealing mistakes 

As the tiger passes Altaira on the patio, first a portion of the tiger's face, and then a portion of the tiger's hind leg vanish in the split-screen effect.
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In several wide shots of the crew members outside the ship, there is a faint vertical shadow visible on the painted backdrop behind the ship. It appears to be either a fold in a piece of fabric or the corner of the sound stage wall.
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As Morbius shows the Commander and Doctor around the Krell underground complex, sometimes they cast shadows on the ground and sometimes they do not. Also at one point their reflections can be seen in puddles of (rain)water lying on the surface on which they are walking.
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When the ship's cook is picked up by the magnetic crane, one of the wires that really picks him up is clearly visible.
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When Robby takes Doc's lifeless body to the tractor, we see Robby is really carrying a dummy.
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When Altaira is swimming - apparently naked - in the pool, she is wearing a skin-colored strapless dress as she emerges from the pool.
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Spoilers 

The goof items below may give away important plot points.

Factual errors 

They are 98.6 million miles away from the planet when it explodes. The light from the explosion would take almost 9 minutes to reach them.
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Revealing mistakes 

After Robby the Robot short circuits due to logic conflict between obeying Morbius (ordering him to destroy the monster) and knowing that destroying the monster (id of Morbius) would destroy his master, just before the shot ends after Robby is supposedly immobile, his arms wiggle.
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Revealing mistakes 

Two visible glitches in the last scene in the film. As Adams and Altaira stand watching the view screen as Altair-4 explodes, the shot of the couple abruptly freeze-frames while the Altair explosion is shown. Immediately after, in the close-up of the two embracing, there's a visible cut in the film and the pair (plus the Bosun in the background) slightly shift in position.
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See also

Trivia | Crazy Credits | Quotes | Alternate Versions | Connections | Soundtracks

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