Firefly reference in Castle

Did anyone else catch it in this week's episode? It made me laugh.
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SPOILERS
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Castle and Beckett have two Chinese guys at gunpoint, wanting to know where the bad guy went. However, they don't seem to understand. Castle suddenly speaks in Chinese "My partner is crazy and may start shooting at any moment." The men point the way and then flee.

Beckett asks "You study abroad?"

Castle: "No, TV show I used to love."

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I'm not normally too picky about duplicate threads but people have been talking about this in this thread very recently.

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Do'h! I specficaally looked for Castle threads and didn't see any. That one got by me since it didn't say Castle in the title.

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