Visible crew/equipment: The camera is visible in Cyclops' glasses when he is in Logan's room and says, "Oh, and Logan: stay away from my girl."
Continuity mistake: When Mystique reveals herself to Senator Kelly on the helicopter, her blue body is appearing and it shows Senator Kelly watching for a few seconds, but when it shows Mystique again, the blue body thing continues from the part it left off at. It should have been to her legs at the rate it was going at before.
Revealing mistake: In Toad's final scene of the movie, when he is beginning to fight Storm, he leaps into the air onto the balcony railing. If you look at the back of his belt, his wire is very, very obviously visible. There are several times within the movie when Toad or Storm has a wire showing, but none so obvious as that one.
Revealing mistake: When Storm is using her powers to blow Toad out of the Statue of Liberty there are things swirling around and blowing, but a rack of T-shirts doesn't move.
Revealing mistake: During the montage that introduces Xavier's School about 27 minutes into the film, you briefly see Cyclops shooting several Frisbees/clay-pigeons out of the air. Watch closely, and you will see that the falling debris from all of the clay-pigeons simply "fades away" shortly after each one explodes. They aren't burning up or disintegrating from his beam. You can see them "fade away" as the animation finishes when each one explodes. A shortcut in the CGI rendering.
Continuity mistake: When Wolverine and Rogue are in Wolverines truck, just prior to the crash, we see them driving near huge trees with thick leaves that can't be seen through. When Rogue says the line "You really should wear your seatbelt", the view out her window shows a handful of trees that one can see through for a mile.
Continuity mistake: When Senator Kelly meets Magneto for the first time, it's outside and cold. When you see Kelly his breath shows blowing to the left of the screen. But when you get the reverse angle of Magneto and Mystique their breath also goes off to the left of the screen. It should be blowing to the right.
Continuity mistake: When Logan is driving his truck the road is free of snow, but when he gets out because he hears Rogue in the back, the road is covered with snow.
Revealing mistake: When Magneto is lifting up Wolverine on the train, you can see screws on the bottom of his claws. His claws are natural, with metal directly bonded to them, and did not need to otherwise be attached.
Continuity mistake: In the medical bay at the end, Jean's medical coat keeps jumping from positions on her shirt between shots.
Continuity mistake: Logan stabs Rogue through her chest, but there are no marks in the front of her dress.
Continuity mistake: After the last fight Logan is lying at the top of the statue with some wounds on his forehead. In the next shot those wounds increase size and have more blood on them.
Answer: The ring she is wearing is not an engagement ring because they are not officially engaged until X2.
LizzieWD