User blog comment:Uhohspaghhetiohs/Time Travel Palooza!! A HTF Special./@comment-5640131-20130406125351

Oh yeah if you're wondering about the crossover characters (Statler and Waldorf, Bender and Fry) here is the thing:

I thought it would be Funny to include some of them at specific time periods (eg: Statler and Waldorf witnessing Lincolns assasination)