In I Will Remember You, Buffy says to Angel, “What is it? You can see me, but I can’t see you? What are we playing here?” This is similar to what Giles says to Angel in Pangs when he tells him, “It’s not fair. You know that’s what she’d …

When Buffy first arrives at Angel’s office, just after she says, “a little upset”, you can see Angel’s reflection in the office door behind her.

The cross that Doyle is wearing round his neck in The Bachelor Party jumps from being inside his vest to being outside between shots when he is talking to Harry.

We find out a lot more about Doyle’s history in the episode The Bachelor Party. He used to teach third grade kids, and helped out in soup kitchens, where he met his wife Harriet. They were madly in love but separated when he discovered he was part demon aged …

When Kate catches up with Spivey in Sense and Sensitivity, he throws a bag on top of his car. In the next shot it has gone, but then appears again in another shot.

A second assistant director on Angel named Robert Papazian Jr was probably the influence for the name of the character Little Tony Papazian in Sense and Sensitivity.

Both Angel and Buffy paraphrase the sentence “Light at the end of the tunnel”:
In Hell’s Bells, whilst tying Xander’s tie, Buffy says, “You and Anya give me hope. It’s like… you two are proof that there’s light at the end of this very long, long, nasty tunnel.” Then, when Xander …

Cordelia says in The Ring, “You’d think people’d get enough gratuitous violence watching Jerry Springer”. The Jerry Springer Show was famous for it’s fights between guests.

When Angel is fighting Trepkos his wounds, including the prominent stab wound in his chest change places, and even vanish throughout the fight.

When Angel is leaving the building where the fights took place in The Ring, there is no blood visible under his jacket from where Trepkos stabbed him with the wooden pole.

Both the Angel episode The Ring and The X-Files episode “Firewalker” featured a character named Daniel Trepkos - both were written by Howard Gordon.

The following scene was cut from The Ring:

Wesley: “All I’m saying is you might have thought of the horsehair sooner, not that being flung across a room isn’t jolly good exercise”.
Cordy: “Speaking of horsehair, where did you find that jacket?”
Guard: “Mr & Mrs Winslow, good to see you again.”
Wesley: “Don’t …

In Eternity, how can Angel jump through the window into Rebecca’s apartment to save her from the intruder? He was never invited in.

In Eternity, Angel says about Cordy’s play, “I’ve been to Hell but that was so much worse”. He’s referring to Becoming (Part 2), in which Buffy sent him to hell to save the world.

The following lines discussing Cordelia’s role in A Doll’s House were cut for length from Eternity:

Wesley: “I’ve always regarded Nora as one of the seminal characters of late-nineteenth, early-twentieth century literature”
Cordy: “Yeah, but I thought I managed to breathe a little life into her, anyway. You have to …