Goofs

When the Fantastic 4 building is seen at the ending, it is undamaged. However, Galactus had previously destroyed a large part it when grabbing baby Franklin.

When Sue is lying on the street following the battle with Galactus, the positioning of her arms and legs changes several times between wide and close-up shots.

When Sue and Moleman enter the room to speak with Reed, they both step down two sets of stairs. One white set coming out of the door, and then a set of red steps following that. In the next shot, Sue is back at the top of the red steps.

Electricity is consumed at the same instant that it is generated. Asking the entire world to conserve electricity would be of no use unless there were enough batteries to store that much electrical energy (a near impossible task). Even if the futuristic premise allows for building such a scale of storage in mere days, it is not mentioned or acknowledged at any point.

Space travel could pose significant risks to a Sue's pregnancy, mainly due to microgravity, increased exposure to cosmic radiation, and altered environmental factors unique to space. Emergency care and neonatal support would be also extremely limited, raising the risk of severe complications for mother and child.

Ben comments: "If it has any egg white in it, it isn't meringue." This should have been egg yolk instead, as meringue is literally egg white and sugar.

The birth of Franklin in zero gravity appeared unnaturally sterile, lacking any presence of bodily fluids, placenta, or typical birth discharge floating around.

Correction: There are births with surprisingly little fluids (blood). The babies always have grease on their body, which has been shown correctly in the movie.

When Sue Storm introduces her baby to the public, she says that her parents died in a car accident. Then she says that her dad was driving and "he survived." Therefore both parents didn't die in the car accident.

Though technically, the dad could have died on the scene and be resuscitated by emergency responders.

-Correction: Sue doesn't say that their parents died in a car crash - she says that their parents were *in* a car crash, and that their dad lived but their mom did not.

Reed says the deal with Galactus was "mathematical, ethical and available". Actually it's anything but ethical.

However, what is and isn't ethical is purely a matter of opinion. What Reed said is his opinion and not a factual error.

Sydney, Australia, is shown with the Sydney Opera House seemingly fully built on the outside. The Opera House wasn't fully built externally in 1965. However, this is a different version of Earth (Earth 828) than ours and exists on a different timeline. There's no telling when the Sydney Opera House, or anything else, was built on Earth 828.

Early in the movie, when Reed records cosmic sounds, the engraver starts on the inside edge of the disc, by the label. Later, when Johnny listens to the disc, he starts on the outside edge, like a normal LP, but this would result in him hearing the sound played backwards.

Franklin Richards goes from a newborn to a baby too quickly. That kind of growth takes 6 months to a year. While they did spend a month in space, the child appears to be between 3 and 6 months old on the Four's return to Earth and then never changes despite a further year happening on screen. This is due to limitations on infant actors.

When Johnny is telling Sue that he translated Silver Surfer's language, he goes to give her a high five. This movie takes place in 1965, and the high five wasn't invented until the 1970s. Of course, in Earth-828, the high five may have originated earlier.

When testing the transport device they ask everyone on the planet to not use any electricity to avoid any power drain. However, when attempting the actual transport the whole planet seems to be watching live on several TV sets. This would be a massive drain on power.

Depsite saying that it will take all the power on earth to make the plan work, the attempt is being broadcast live and people around the world are watching it.

Reed performs CPR incorrectly. His compressions are too shallow and too high up on Sue's chest, and his rescue breaths are too frequent. Reed only checks Sue's breathing and not her pulse before beginning, which is perfectly acceptable for CPR nowadays. Although he should have asked for help immediately (one person on the chest compression and one person on the breathing).