Goof seen at 35:40 in Intervention

As Spike’s making his getaway from Glory, he heads towards the lift which pings and goes down. But who pushed the button for it? Spike wasn’t close enough to when it starts to move, and when he falls on top, through the hatch and it …

In the episode Sleeper Aimme Mann sings her song “Pavlov’s Bell”. The title of this song references Pavlov’s experiment with dogs, where he would ring a bell before giving them food. It got to the stage that every time the bell would ring the dogs would salivate in anticipation of …

Willow’s wishes for Buffy then a million dollars in Triangle could be a reference to the pilot episode of Friends - Ross says he just wants to be married again and Rachel enters Central Perk in a wedding dress, and then Chandler says he just wants a million dollars

Clayton Rohner played Las Vegas casino owner Lee DeMarco in The House Always Wins. He appeared in David Boreanaz’s show Bones as Wayne Kellogg and has been in Trespassers, Into the West, Jake 2.0, Coronado, CSI: Crime Scene Investigation, Jack & Jill, Charmed, G vs E, The X Files (as …

A sign in Las Vegas for Lorne’s show, seen in The House Always Wins calls him “The Green Velvet Fog”. This is a reference to jazz singer and song-writer Mel Tormé (1925-1999) who was known as “The Velvet Fog”. He co-wrote Nat King Cole’s Christmas hit “The Christmas Song (Chestnuts …

The cast and crew of Angel went on location to Las Vegas for this episode The House Always Wins. Though the action was set at the Tropicana, much of the filming took place inside the Riviera Hotel.

The title of the season four Angel episode Ground State comes from a physics term. Wikipedia says of ground state:

The ground state of a quantum mechanical system is its lowest-energy state. An excited state is any state with energy greater than the ground state. The ground state of a quantum …

Dinza is one of the Eleusian mysteries, the dark demi-goddess of the lost. Only the dead can enter her presence, and those that do, she often traps for eternity. Angel spoke with Dinza in an attempt to find Cordelia in Ground State.

The Axis of Pythea, seen in Ground State, is an ancient power that bridges all dimensions. It was forged from the tripod of the Delphic oracle into a metal arch set into a marble base. It stands approximately two feet high and weighs eighteen pounds. The Axis is …

In Ground State, Gwen takes the glove off her left hand when she’s at the table with the businessman. She zaps his watch, but when the camera pans away and you see Gwen walking away, the glove is back on.

In Deep Down, Linwood tells Lilah, “This is my corner of the sky”. This is an in-joke as John Rubenstein (who plays Linwood) starred in the original Broadway production of the musical Pippin, in which one of the songs he sang was titled ‘Corner of the Sky’.

In Deep Down, Lorne says “Not a peep. But if I Miracle-Ear anything I’ll send up a smoke signal.” He’s referring to the hearing aid that is advertised as being so small it’s almost invisible.

Kay Panabaker played the little girl in the White Room on Angel in Forgiving and Habeas Corpses. She was aged 12 and 13 when she was on Angel. Kay also appeared in the television series’ CSI: Crime Scene Invesigation, ER, Seventh Heaven, The Division, The Brothers Garcia, Phil of the …

On Angel, many of the Wolfram & Hart lawyers have first names that begin with ‘L’ and surnames beginning with ‘M’ (Lindsey MacDonald, Lilah Morgan, Lee Mercer, Linwood Murrow).

In the Angel season four episode Long Day’s Journey, the totem Manget, or Manny, makes a remark about how he can’t retire to Boca now. He is referring to Boca Raton, a city about an hour outside of Four Lauderdale, Florida that is known for its population of retirees.