When I watched "What Kate Does" again last night...I noticed that Claire's sonogram had the date 10/22/2004. That is 1 full month past the original crash of 815. (OK, this may be another difference between timelines) However, when Randy was firing Locke, he mentioned that Locke had planned to go on vacation in October...according to the sonogram, it is October. (since they both were on the plane that didn't crash and claire went to the hospital that same day)... What gives???