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Years later, I've just had a realisation as pertains to this particular thread:
Castle stars Nathan Fillion, right? He's actually read Alpha Flight. (He mentions it in his intro to... the Serenity...

That is cool! And much more prominent than the Castle one.

(That's why I put it as 'appearance as opposed to mention'... I knew about that one...)

Wow, is this their first TV appearance (as opposed to mention) since Red Dwarf?