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Road to the Multiverse - S8-E1

Trivia: This episode spoofs the TV series Sliders, where the main characters randomly jumped between dimensions without being able to get home.

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Penance - S2-E9

Trivia: When Jimmy first speaks to Magnus, he says "Love the hair." Amanda Tapping and Michael Shanks worked together on Stargate SG-1, during which time Amanda had short blonde hair, while in this show she has long brown hair.

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Trivia: Another Bruce Lee reference: When Kato demonstrates that it's him, not the Green Hornet, that has the power, he uses (an exaggerated version of) Bruce Lee's One Inch Punch.

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Vampire Weekend - S2-E6

Trivia: When they find a dead body in the cemetery that has been staked, Castle mentions Buffy. Nathan Fillion starred as a priest in Buffy The Vampire Slayer.

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The Mistress Always Spanks Twice - S2-E16

Trivia: The woman playing Kevin Ryan (Seamus Dever)'s girlfriend is Juliana Dever, Seamus's wife.

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