I don't know why this didn't occur to me earlier, but the title of next week's episode, "Sundown," could be a play on words along the lines of "Lockdown." Uh-oh.
Bonus thought: If Alt Ben is a teacher in Alt L.A., then he and his father were probably never brought to the Island in the 70's to work for DHARMA. And since they both would have arrived on the Island pre-Incident, it seems to suggest the Island was destroyed much earlier than that.
Edit: Bonus, bonus thought: Jack suggests David is a Red Sox fan, but David has a Dodgers poster on the door to his room. Discuss.