In episode 6 of the second season, we saw the fulfillment of a number of predictions made earlier in the series.
There are a number of spoilers involved in this question.
We saw the television footage announcing them as the "ASBO Five" being filmed, as well as the interview with Alisha, that we had seen earlier (season 2, episode 3) in Future Simon's apartment as part of the footage and pictures that Future Simon told Alisha was going to occur. Alisha also reveals to Simon the identity of Future Simon, and their (inevitable?) relationship.
At the end of episode 6, Curtis rewinds time, and they visit "The Big Cheese", at which point we see Curtis punch him. They then end their community service, implying that none of the events of the rewound timeline ever occur (except in Curtis' memory).
In the Christmas Special, we see the gang several months later. We find out that:
They are all poor (except, perhaps, Simon, due to the apartment from Future Simon) with mundane jobs. It seems clear that they never became the "ASBO Five". However, Alisha and Simon are now dating, and Simon knows about Future Simon.
How does this reconcile? Does the end of episode 6 create a paradox with the information Alisha sees in episode 3?