Toward the end, the Closed Caption has Castle saying "Once More Unto The Breach," when the correct phrase is "Once More Unto The Breech,," i.e., let's fire the cannon again." This referred to the practice of allowing a cannon to cool after several firings, since a hot cannon could burst or fire prematurely, either of which was dangerous to the crew.
When Javier is speaking French, the subtitles do not match what he says. He says "Je le sais mon petit chou chou", the subtitles say "Je le sais, ma petite jolie".
Watching "Wives of Wall Street" with Castle, Martha seems to think that the series is unscripted. While they try to create the unscripted portrayal of reality, reality shows are scripted that way.