When Doom enters the elevator after arguing with Reed he is holding his gloves in his hands. In the next shot he pulls off a glove and punches the wall. [We see Doom holding his gloves and in the next shot he punches the wall. We never see this "mistake".]

When Ben Grimm is on the bridge he stops an oncoming semi-truck by simply allowing it to slam into him, at which the truck halts cold and crumples under Ben's immense resistance. But although Ben, as The Thing, may be able to withstand such a collision unhurt, he still cannot stop a speeding truck dead in its tracks. As is evidenced by other scenes, Ben is rather heavy (massive), but not so heavy that his mere weight causes damage to various floors on which he walks. His body lacked sufficient inertia to stop the truck at that speed; He would've been dragged along with it. [In accepted comic physics, a character with superhuman strength also creates sufficient inertia to negate the effects of what they are stopping in some unknown way. I.e., if they have the strength to move an object, they can stand still and take the impact of a collision with that same object.]

When Doom and Thing hit the pool, just before they go through the floor, the guy trying to get in his door (last door on the left) goes missing while they show the water flowing down the hall. [The man doesn't go missing; it shows him fumbling with his card key and barely making it into his room before the water rushes by.]

When Dr. Doom is trying to eliminate the Fantastic Four, he makes Ben 'normal', then he freezes Reed, then he thinks he destroys Johnny with the missile and says "Two down, two to go." He should say "Three down, one to go". [Ben was obviously able to regain his superpowers, so he wasn't taken out of the picture yet. Dr. Doom thought Johnny had been killed, and he thought Reed completely incapacitated. Ben was fine, just temporarily not "super" anymore.]

In the scene where Johnny in watching the X-Games you can see it is night outside. However, when he drives to the games it changes to day. [The X-Games take place over several days. He went the next morning.]

When Vic is holding Reed hostage, and is super-cooling him, he bends back Reed's finger. You can see that he lets go of his finger, so he wouldn't hurt the actor. Reed groans after Vic lets his finger go and the snapping sounds continue. [The camera pans up and we can't see Reed's fingers anymore, there is no way of telling if Doom let go or not.]

In the scene where The Thing walks into a pub, the pool table bounces up and down. Beneath the green ball is a ring, holding the ball in place. [That's not a ring, that's where the number 4 is, and its pointing down (towards the table).]

When Victor is first looking at his stitches in the mirror, they are on the right side of his face. He even tells his assistant to make sure he is only photographed from his left side. For the rest of the movie, though, his scar is on the LEFT side of his face. [When he is looking in the mirror, the scar is supposed to be on the opposite side, as it is a reflection. Furthermore, he tells the assistant to only photograph HIS left side, which is also correct because HIS left is on the right side from the viewer's point of view.]

In the scene where Johnny Storm and The Thing are arguing in the lobby. You can see in the background a man wearing a raincoat looking directly at camera. Then suddenly he is pulled out of shot by an unseen crew member. [This man was a background extra, he could be seen in another shot earlier. He was pulled off camera by an actress who did not want to get involved with Johnny and The Things argument. Even after he was pulled away, on the left side of the shot you can see a woman in a black dress watching the scene take place. I doubt the crew would allow her to stay if the shot was to be cleared.]

When they are testing the Human Torch's powers, they say that a temperature as high as the Human Torch's can "ignite the atmosphere and destroy all life". This is also incorrect. Nuclear bombs create temperatures approaching 10,000,000K and they have not ignited the atmosphere. [Not true. Johnny was registering in Kelvin, a scale that is different and higher than the much used Farenheit scale. Nuclear bombs can reach up to 15,000,000 degrees Farenheit but that is not like the sun's temperature of 4000+ Kelvin.]

When the crew first arrive on the space station we hear an announcement: "ETA to cosmic event." ETA stands for Estimated Time of Arrival, which means he said Estimated time of arrival to cosmic event. Makes no sense. [People say stupid things like "ETA to the Tsunami". You understand what is said but it comes down to a grammatical (character) mistake.]

A vital part of the denouement comes as Doom is disabled when he is superheated and then cooled down by being sprayed by water. As Reed has it - "You know what happens when hot metal is rapidly cooled." Not much that will help them, actually. Water cooling of hot metals is an important part of the process of hardening them. Spraying ordinary fire hydrant water on red hot metal will make it stronger. Since Doom's metal body was overheated they should have made him even hotter, pushing him to melting point (we already know Johnny can generate enough heat to melt tungsten) rather than helping him out by cooling him back down. [The important part was that as the metal hardened it would lose its elasticity and he would be unable to move, which is exactly what was shown on screen.]

When Johnny walks out to meet the press for the first time on the bridge, Sue tries to stop him by saying, "Get back here right now, Johnny," but her mouth doesn't move. [You cannot see Sue's mouth when she is speaking, she is passing behind a truck.]

You can hear Julian McMahon's Australian accent when his assistant asks him if he should rest and McMahon says, "Later. First I have some unfinished business to attend to." [It is not really a mistake to have an Australian accent.]

In the scene with The Thing and the firetruck, the fireman on the ladder is first facing forward toward the water as the ladder falls away from the truck. After a few shots the fireman is shown facing the other direction, and falling away from the camera. Then after a few more shots the fireman is facing the water again as the ladder reaches the end of its reach and he flips over the last rung. [There are two firemen on the ladder one trying to climb back to the truck. The other facing the water as the ladder extends.]

During the bridge scene, The Thing shows incredible strength by wrecking a truck by simply lowering his shoulder. Later in the movie however, when the Fantastic 4 are fighting Dr. Doom, he is thrown full speed onto a much smaller car driven by two women. When he gets off the hood, we see he has not even left a dent. [There was a dent, but because of the dark colored car and night time, it was hard to see.]

When Johnny leaves the Baxter Building after arguing with the Thing, he is wearing khaki colored cargo pants and a leather jacket. When he comes back after Ben's transformation into human, he has on blue jeans and a red blazer. [He had a place to live before they all moved in with Richards. He could have easily left clothes at his place and went there to change or he could have just gone and bought some new ones.]

You can tell that Susan purposely hits the bottle of wine off the table, when she first finds out that she can turn invisible. She gasps before she hits it. [She gasps because she's invisible. Bit of a shock, to suddenly find yourself invisible. You might even gasp first and knock something over second.]

In the scene where The Human Torch does a stunt on the motorcycle, the announcer says something like: "Come on, that's old school, show us something new." When the announcer says that, the microphone isn't near his mouth, and his mouth doesn't move either. [The announcer isn't in any of the multiple shots during the period in which he says that line. So it cannot be known whether the microphone is anywhere near his face.]

When Johnny Storm shows The Thing the doll that was made, he says he is leaving and goes into the elevator. However, the camera stays on the same floor, but you can see the Ground Floor Exit. [They are already on the ground floor. The Thing walks out the rear door. The "ding" that is heard is from Susan's elevator reaching the ground floor just before she exits it and appears in the shot.]