The librarian calls Margo "Janet", Margo's name is Janet in the books.
This episode introduces Josh Hoberman. In the books, he was one of the Physical Kids along with Eliot, Janet, Alice, and Quentin, but here he is introduced somewhat differently.
At 32:54 Josh says "Come with me if you want to live ". He is quoting Kyle Reese's admonition to Sarah Connor in the first "Terminator".