How could Connor's duplicate look like him while Lindsay's duplicate didn't look like her?
In this episode, parts from the closing scenes from "The Perestroika", The show's 1st season finale, are seen in the second time since the show started. Those are the same parts that were seen in "Threads", the second season's first episode.
Lindsay had said to Lilith in this episode that she had always wanted a sister. It is ironic that in the same day, Lindsay got a sister and Connor back (which were both of the things she wanted the most) and lost both of them on the same day. Also, Lindsay could look at Lilith as her sister, but Lilith was actually a newer version of herself.