Corrected entry: In the last episode after Cameron travels forward in time, Kagame says he remembers Liber8 from Uncle Julian's stories of when he was younger, indicating that Cameron et. al were successful in changing the present. Then at the fountain scene she sees her son. When current (aka old) Alec holds her back, the immediate assumption is that the time change also changed who Cameron's son's mother was. But then Alec explains that everyone thought she died the day of the accident at the execution, insinuating that Cameron's husband remarried and that this woman was Cameron's son's step-mom. The plot hole exists in that if there was no modern Liber8 there would not have been an execution or accident (time travel) in the first place, so there would be no reason for anyone to think Cameron had died. In fact, had she been successful and managed to come back at essentially the same day/time as she left, no one other than Alec would have known she left since it would not have seemed that she was gone at all.