Look carefully at the balloons in the vacuum chamber and you can see the explosive caps on them.
Without an air hose or some other means of directing the air to his and Robin's mouths, any air from the utility belt would be sucked out of the room as quickly as it was released from the utility belt tank.
Alfred: Shall I bring in the pièce de résistance, sir?
Multimillionaire: Pièce de résistance?
Robin: French, sir. It refers to the feature of the evening.
(After Penguin is captured)
Batman: Hoist in your own evil net.
Batman: Have you ever popped out of a cake before?
Gordon: Only you could be so resourceful. Only you could put that pusillanimous poltroon of a penguin to flight.
Alfred cleaning windows and singing Rule, Britannia
Rule, Britannia is a popular British patriotic song that is based on the poem of the same name written by James Thomson in 1740 with music by Thomas Arne.