Throwback: Continuity Issues in "X-Men Origins: Wolverine"

1. In X1, Sabretooth's eyes are black in X1 and normal in XOW.
2. Sabretooth had two sets of fangs in X1 and one set in XOW. While we can assume that he made massive physical changes between XOW and X1, why would they happen over a span of a few years when he's lived for over one hundred years without changing?
   
3. Sabretooth shrank in height and changed hair color from brown to blonde.
   
4. Sabretooth didn't seem to recognize Wolverine or indicate they knew each other in any way.
   
5. The flashbacks in X2 indicate several people in surgical masks, yet there were none present in XOW.
6. An X-ray in X1 showed the intricate blade work in his hands, but there was apparently nothing done besides injecting Adamantium to his bones.
7. Striker's accent changes from X2 to XOW.
8. Sabretooth barely spoke in X1 in private or public, however in XOW he was extremely vocal and had an ironic sense of humor.
9. Professor X is standing in XOW. However, he was in a wheelchair in the flashbacks of X3 when he visited Jean Grey. If we assume she was ten at that time then Scott would have been one (nine year difference between them). At the time of the film it would have been, at least, fifteen years later and he's out of his wheelchair and can walk. So, apparently, he went back into his wheelchair by the time of the first film X1. While it was never explained in the movie how he became a paraplegic, the movie introduces the idea that it happened more than once. [Source]