Bethany Chaulk in Untouched had telekinetic (also known as Psychokinesis) powers - the ability to influence the behaviour of matter by mental intention, or put more simply, the ability to move objects with her mind. Telekinesis was made famous by Stephen King’s novel Carrie, and the 1976 movie portrayal of …

Cordelia says in Dear Boy about Angel and Darla, “Imagine Bonnie and Clyde if they had a hundred and fifty years to get it right”. Bonnie Parker and Clyde Barrow were notorious robbers and criminals who traveled the central United States during the Great Depression between 1931 and 1935.

In the script for Dear Boy, Lindsey compliments Darla on her ability to manipulate Angel with the following exchange, some of which was cut due to length:

Lindsay: “We’re counting on that. You’ve given us more information on Angel than we had when he first got here. Nobody …

The demon Turfog in Dear Boy is described by Cordelia as a “mush monster”. The slimy demon grows between pillars, unable to move. It’s acolytes battle endlessly over how best to worship it.

In the Buffy episode Angel, Angel grabs Darla and she says “That’s good. You’re hurting me. That’s good, too.” When Angel grabs her in the Angel episode Dear Boy, she says “You’re hurting me. I like it.”

In Dear Boy, Wesley loosens his tie, but in the next shot, from the side, he loosens it again.

When Bethany’s father is talking to her at the end of Untouched, you can see Angel standing leaning against the wall behind him, but we don’t see Angel stand up and get forced against the wall by Bethany until later (39:34).

Angel says to the bystanders in Untouched, “Hey, you wanna get back behind the tape? You gotta gawk, go home and watch a high-speed chase on Fox”. He’s referring to Cops, a reality show shown on the Fox network.

The script for Untouched, in the scene when Bethany comes into Angel’s room while he’s dreaming about Darla says: ‘She slips her hand under the covers and runs it up his thigh”. In the aired version, her hand remains outside the covers.

In Judgement, the hunch-backed demon Mordar the Bentback sings Marvin Gaye’s “Sexual Healing” in Caritas.

In First Impressions we see that Angel Investigations has started to move into the Hyperion Hotel, seen first in Are You Now Or Have You Ever Been?

Actor Denzel Washington Denzel Washington is referenced a couple of times in Angel. In First Impressions, the gang have the following conversation:

Gunn: “I haven’t bothered to see a movie since Denzel was robbed at the Oscars for Malcom X. Later.” [He leaves]
Wesley: “That was quite a performance.”
Cordelia: …

When Darla takes of Angel’s jumper in First Impressions, the tattoo on his back is missing.

The script for First Impressions describes the aftermath of the the garage battle as:

“What’s left of the attacking vamps. Not three neat little piles, nothing too cutesy, but clearly dead dusty chunky vamp dust.”

The first song Angel first sings in Caritas in the episode Judgement is “Mandy” revealing his secret shame - a love of Barry Manilow (”I think it’s kinda pretty”). He also listens to the song in the episode Orpheus, and sings a version for Jasmine in The Magic Bullet.