Ethros demons have the ability to possess humans and take over their body. They excrete a sticky substance called plakticine, the amount of which one can determine the approximate maturity of the possessing Ethros. It’s presence can be revealed by feeding the demon’s host Psylies Eucalipsis powder. …

We know that vampires can’t breath but when Angel first comes out of his grave in The Prodigal, we can see both his and Darla’s breath in the cold air.

Kwaini demons are generally peaceful, articulate, gentle, and always female. Their adrenal glands are usually the size of a walnut, but could become enlarged. This occured in some Kwaini when they became addicted to a drug which contained eye of newt. It had an effect on them similar …

The first appearance of Darla (Julie Benz) on Angel was in The Prodigal. She was dusted by Angel in the Buffy episode Angel three seasons earlier, and seen briefly in a flashback to Angel’s siring in Becoming (Part 1).

We find out in The Prodigal that Angel’s name before he became a vampire was Liam. He was born in 1727 and was sired by Darla in 1753, making him 26 when he was sired. His first kill as a vampire was a grave-digger who came across his recently …

The following are stage directions from the script for The Prodigal:

The first time we see the head demon: “OUT OF THE SHADOWS waddles (or walks or skips or whatever Mister Miller is devising) HEAD DEMON GUY. And boy, is he ug-leeee.”

The demon’s death: “He [Angel] snatches it [the …

Howler demons are slimy, bald, with white skin, and claw-like hands. They give off a sulphuric odour, and emit a high-pitched wail or howl, in preparation to fight or mate. Angel fought a pair of Howler demons when investigating a supposedly missing person in The Ring.

David Nabbit was supposed to become a recurring character in Angel, but this didn’t work out due to scheduling. He appears in War Zone, To Shanshu In L.A., and in the season two episode First Impressions.

I swear there’s a visual reference to the movie Grease in the episode Flooded.
Towards the end of the episode, when Buffy steps out onto her back porch a lit cigarette butt lands at her feet, and she immediately knows who flicked it. Buffy extinguishes it with her (stylish yet …

In Flooded, Anya says to Xander, “don’t be such a wienerdog”, trying to persuade him to make an announcement about their engagement. This is a reference to the Todd Solondz film Welcome to the Dollhouse, in which the main character is cruelly taunted with the name ‘weinerdog’ by all the …

When we see Cordy drink Angel’s blood suppy in Expecting, she drips blood down the front of herself but later, when see her hit Wesley with the book, there is no blood there.

The Haxil Beast (latin name: ‘Haxil Daemonica’) offers wealth, fame and success to human men to impregnat human women with it’s spawn. It then telepathically controls the women via it’s link to it’s unborn children. The gestation period is very short and the women give birth very quickly. …

This stage direction is from the script for Expecting, in the scene in which Angel and Wesley get the wrong house whilst demon-hunting:

Wesley charges in, startling an ELDERLY COUPLE watching TV. Angel charges in behind him, SMACK! right into the ‘No Uninvited Vampires Allowed’ threshold.

Both Cordelia and Wesley have drunk blood on Angel - Cordelia drinks Angel’s blood supply from his fridge in Expecting and Wesley is offered blood when pretending to be Angel in Guise Will Be Guise.

Jeremy Renner, who played the vampire Penn in Somnamulist, has also been in A Little Trip to Heaven, North Country, Lords of Dogtown, S.W.A.T., Monkey Love, CSI: Crime Scene Investigation, Fish in a Barrel, Time of Your Life, The Net and Zoe, Duncan, Jack & Jane.