Emma still has the video camera at the end but the video cam she took from the house she broke into so would not have been allowed to keep it.
When Mary Margaret runs into Will she tells him that she's married to the sheriff he asks if she's married to the blonde to which she says that's her daughter. Both David and Emma are blonde though.
During the flashbacks, set in fall 1998, Lily makes reference to Harry Potter, which had only just come out in September of that year in the US, and barely 18 months prior to that in the UK. It is unlikely that Emma would know who Harry Potter was even if Lily did.