Corrected entry: Dr. Doom's fictional kingdom, Latveria, is supposed to be located somewhere in Eastern Europe. In the closing shots, as the ship with Dr.Doom's container sails "LATVERIA" is written on it. Right under that are 3 Russian words that make no sense whatsoever. Basically, it translates as "the head of the toe." Evidently, the screen writers just flipped through a Russian dictionary when writing the scene.
Corrected entry: Dr.Doom picked his mask from some sort of store. Thus, it was unlikely to be made of titanium or some other heat resistant alloy. The heat generated by the fire during the final battle is big enough to melt Dr.Doom himself, yet the mask is intact. It should have melted first.
Correction: The mask was actually shown to be a gift from his home country of Latveria. It can be seen in his home earlier in the movie and you can see the plaque on it when he smashes the case to get it out. So there is really no saying what the metal was, that the mask was made out of. And since Doom didn't actually melt in the final battle - it actually seems to solidfy the alloy that has taken over his body (and as evidenced by the play with electricity in the cargo hold, showing that there is still life in him). It seems entirely probable that the mask could survive as well.
Corrected entry: 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.
Correction: That's not a ring, that's where the number 6 is, and its pointing down (towards the table).
Corrected entry: Reed explains that the suits they wore when they were hit by the cosmic storm adapt to their physical abilities (for example, Susan's suit turns invisible with her). But when Reed saves the fireman on the bridge, he wears "normal" clothes. Nevertheless, these clothes stretch together with Reed's body. He wouldn't have made special clothes by then because he didn't want to be a superhero at this point. Also, Susan Storm's clothes do not disappear with her on the bridge moments earlier.
Correction: In the shot on the bridge when Reed is saving the fire fighter, his clothes do not stretch, but his arms stretch past his clothes. The stretching of his arms wouldn't have to affect his clothing.
Corrected entry: On the bridge Jessica Alba strips down to slip by the police. Yet afterwards when she is putting her clothes back on both Reed and Johnny have gotten by the police as well. Why was it necessary for her to become invisible if the other two got by the police without much trouble?
Correction: Well, a VERY attractive woman stripping down to nothing, who suddenly turns invisible, may have distracted the police long enough for two other people to slip by them.
Corrected entry: In the scene where Johnny leaves the building after having a fight with Sue he is wearing a blue jacket. Later when he sees that the machine had been activated and runs back he is wearing a red jacket.
Correction: It is not unrealistic to think that he could have bought a similar jacket at some point after the explosion.
Correction: Just because it doesn't make sense in English doesn't mean it's a movie mistake. It could be some sort of meaningful metaphor to Latverians.
Xofer