The marquis on the Paramount Theater where Jerome's followers are gathered are in disrepair, but you can still make out that it read 'The Mark of Zorro (1920)'. That's the same movie in the original comics that the Waynes saw the night Thomas and Martha were killed.
Selina reveals she is 16 years old during this episode. Her mother left Selina at an orphanage when she was 5, eleven years before this episode.