There are also a couple call backs to old episodes also.
When the robot goes 'Silence!" it may be a call back to the robot elders who said silence quite a bit.
Then there's the "Bender, I love you!" A call back to when bender tried being a pimp and at court the whore-bots said the same thing, "Bender, we love you!" "Shut up, baby, I know it." Supposedly this line is from Shaft, but who knows.
Still a freaking funny episode, I've watched it 3 times now.
Maybe more call backs, but those two stand out.
I kind of feel sad for Mop Bucket. She loves that old Janitor.