Continuity mistake: Sue's hairstyle, as well as the texture and length of her hair, and the color, changes from scene to scene, and even at times from shot to shot. This was due to movie re-shoots.
Plot hole: Dr Doom has amazing powers, able to crush people or pop their heads in an instant, which he does to all the humans but not to his biggest threat, the Fantastic 4.
Continuity mistake: Young Reed has blue/green eyes but older Reed has light brown eyes. Eyes never change color with age.
Other mistake: If you look closely after the film leaps ahead a year, Reed's file on Ben lists his birthdate as 1986, but the prologue of the film which features Ben and Reed at roughly 10 years old each is set in 2007. The math doesn't add up.
Continuity mistake: When Franklin sees Johnny on fire for very first time, he is lying on a pad, but in the next shots the pad is gone.
Chosen answer: No, no one from the film asked him to do a cameo. Stan Lee has said he never requests a cameo and waits to be asked.
Bishop73
I read on IMDb that he declined to make a cameo in this movie.
I've never heard him say he declined the cameo. I think maybe the entry was made from an assumption of what Lee told Larry King. Lee mentioned he wasn't in one of the X-Men films or this film and said sometimes the films are shot too far away and he can't travel half way around the world to be in a cameo. But this film was shot primarily in Louisiana and did have a scene shot in Los Angeles supposedly.
Bishop73