A friend of mine, my husband, and I had a Castle viewing party last night for this episode. WE laughed so hard during the first 10 minutes we had to go back and rewatch it! There is no end to our Castle love.

"Didn't you wear that, like, five years ago?" BWAH! Being that "Serenity" was made nearly five years ago. (Was it really that long ago? That makes me sad.)

I squeed when he came busting out the door as Mal. And the bit of "Firefly" music, too!

Gawd, I love this show.

I - being pregnant and hormonal - started crying, full on tears of joy to see Mal again. Could not have had a better opening.

Was I the only one that caught the "non-Fillion related" shoutout? I'm referring to Jon Huertas (Esposito) in the full-on Marine gear. He was a lead player in HBO's "Generation Kill" -- if that wasn't the same costume he wore in the mini, it was a great reproduction.

My heart is full of joy.

now that I'm thinking about it too, the other cop, Ryan, was dressed in medical clothes, which, given the above, was most likely a shoutout to the fact that he played Dr. Devlin on General Hospital for a while.

Yes, but hello, the Buffy reference was awesome...I mean considering she killed him when he played Caleb in Season 7. He was obsessed w/ the First (the oldest evil ever) and tried to take Buffy out. Nathan Fillion is a master at acting...now he needs to reference Drive (may you RIP you fantastic cancelled show)

Did anybody catch the Barker school of design reference? (hello, Clive Barker fans...)

Brown pants...red shirt...susp -- It's MAL!!!!

I SOOOOOO wanted Nathan to say: "I keep hoping it'll come back [in style]." when his daughter asks: "Don't you think it's time to move on?"

That was a pretty amazing episode all round. Loved all of the little winks to pop culture in general. And of course Mal!

Did anyone see the catalyzer? According to Nathan's Twitter, there's one visible right when 'Mal' comes bursting through the door ("under the gun, under the boat, just to the right," he says).

No-one else noted the Dr. Horrible shout-out, too? Working on the memorable laugh?

I bet that outfit was one that he saved for himself. Apparently Nathan Fillion is and was a great fan of Firefly. (From his own mouth, he's mentioned his collection at many a convention).

And Drake, I'm sure there are plenty of things you need to move on from yourself.

LOOOOVED it! We replayed the DVR of that scene three times before we could move on, just about fell off the couch when he came out wearing Mal's old getup. Died laughing, what a treat!

And they bring back the piece of crap "V" when they could have real quality SciFi with Firefly...I don't get it!