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It is interesting to note that in real life, Amber Benson (Tara) and Adam Busch (Warren) are a real life couple.
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There were only two shirts for Alyson to wear during the blood splattering scene (after Tara is shot). The scene eventually took 16 takes to get the blood splatter right, with wardrobe immediately washing/drying the shirts after each take.
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This is the last episode that Steven S. DeKnight wrote before moving over to Angel.
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"Seeing Red" aired a week early in Canada on the wildfeed. Originally this episode was to air on April 30, but UPN made the programming decision to make "Two to Go" & "Grave" a 2-hour event. This forced the episodes from "Entropy" to "Two to Go" to be pushed forward a week.
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The events of the final scene of this episode and the season 6 finale take place between May 7th and May 8th 2002 according to Tara's grave, seen in season 7's "Help".
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"Love's a funny thing." Clem echoes these words that Spike told Buffy and Angel during his Season 3 episode "Lover's Walk".
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Several scenes of this episode (and the next three) were cut out during the airing of this episode in the UK. For example, the attempted rape of Buffy was cut from where she falls and hits her back on the shower to where she kicks him away finally. The exit wound appearing on Tara's chest and her blood being splattered on Willow's shirt was also cut and restarted from where Tara says, "Your shirt." Warren also snaps a demon's neck, but the scenes were altered so that only the sound effect was heard.
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From this episode until the end of 'Grave' all occur within around 24 hours.
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Andrew's mishap with his jet pack is hilariously reminiscent of Wile E. Coyote (a tribute to the late great Chuck Jones).
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Anya changed her hair from Curled (last episode) to straight hair (this episode).
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The banner at the amusement park reading "Opening Weekend" is the same font and color as the "Once More, With Feeling" onscreen chyron.
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Part of the episode was filmed at 6 Flags theme park in California.
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This is the only episode in the show's history in which Amber Benson is credited in the opening titles. In the 45 preceding episodes, she's been credited as a guest star, even though the official guide to the series, The Watcher's Guide: Volume Three by Paul Ruditis, credits her as a series regular throughout season six.