While Tim saying Twist is like Cordelia he mentions this, "the spin-off series which is set in LA."
at one point, Spike thinks he is a "vampire with a soul," a statement that refers to Angel.
When asked how he's doing as he's hacking into the Chinese general's safe, Marshall responds that he's "5 by 5". This is a very recognizable line to fans of Buffy the Vampire Slayer (1997) and its spin-off, Angel (1999), as it is the trademark saying of the character Faith. Episode writer and director Jeffrey Bell wrote, directed, and/or co-produced 61 episodes of 'Angel', and even appeared as an extra in the first episode of its final season.
Referenced by name
David Boreanaz, who played Angel, mentions the Hyperion Hotel.
football stadium's name "Wolfram & Hart" is same name as law firm on show
Quote: "I wish to do more violence"
Appears as an agent codename in the LaFleur list.
Joss Whedon is credited as the creator of "Angel."
DVDs are shown in a video store.
Castle uses the phrase "five by five", which was used by Faith on "Angel"
The tag line "Live Fast. Die Never." that appears on the "Tridark" poster, the fake vampire movie starring Jackson Tyler, was the official tag line of the vampire series Angel.
Annie says' there's a werewolf called Nina in Buffy', however, the werewolf called Nina is on Angel
Carolines description of Booth and Bone's interaction is very similar to Doyle's speech to Angel (also played by "David Boreanaz")
When Victoria first sees a hand through the basement window, you see a truck for "Wolfram Lock and Key" drive down the street. "Wolfram & Hart" is a fictional law group in the TV show Angel. Angel is a spin-off of Buffy the Vampire Slayer, which Emma Caulfield acted in for most of the seasons.
When Caroline Julian asks Booth to come back. She says Booth needs to convince "the powers that be." PTB was often mention in David Boreanaz's previous series.
Linkara discusses spin-offs in which characters become detectives
Ellis mentions the '90s "angel" craze
There is a character named 'Buffy'
Lisa Plays the Theme Song on her Cello.
Amy Acker's character is grabbed by a giant octopus-like creature, much like Illyria's true form was supposed to look like.
A huge demon from Angel is on display in the Almost Human lobby.
Pete asks Sutton, if he is a vampire. James Marsters, who plays Sutton, played Spike, a vampire, on this show.
''Gyspy Curse'' is a reference to Alexis Denisolf's previous show Angel.
Mentioned in dialogue
In Thor's vision of Asgard, the three masks of a wolf, a ram and a hart reference Wolfram & Hart, from this series.
Mentioned in quoted news article
episode clip shown
series is reviewed