I once wrote a tumblr post on this.
How I imagine the Buffy version...
* It wouldn't be called You're Welcome. Buffy hardly ever gets thanked so she really wouldn't preempt gratitude.
* Angel tells Buffy he joined the shady WR&H in order to change it from the inside out but fears he might be in the belly of the beast. It reminds her of BtVS s4 so she tells him about joining The Initiative and how she told Riley he could forge his own path or try to change things from the inside. She mentions the last case she had before they slept together (Bad Eggs), a mother bezoar swallowed her whole but she grabbed a pickaxe on the way in and killed the giant squid from inside its belly. And she's no longer trapped in Sunnydale because the evil was destroyed by going down into the Hellmouth and cleansing the town from deep within it. "From beneath you, it devours."
* Angel says WR&H were hunted and killed by acolytes of a Power That Be and that's how he became the new CEO of it. Buffy says the WC were hunted and killed by acolytes of the First Evil and that is how she became Head of it. So they both took over the ruins.
* Buffy meets Eve. It makes her think how The Initiative had an Adam.
* Angel tells Buffy he had mystics perform a spell to change people's memories so Connor could be inserted into a family. She said she experienced that when monks performed a spell to change people's memories so Dawn could be inserted into her family. That it was extremely wrong and violating but both times it was to save a life (makes her think of turning the Potentials into Slayers to give them a chance to defend themselves) and she's so grateful to have Dawn and she's sure Connor would be grateful if he knew.
* Angel says Connor's new family are named the Reilleys and the similarity to Buffy's ex, Riley, is not lost on them.
* Buffy meets music loving demon from a hell dimension Lorne. She mentions Kathy, her first college dormmate, a 3,000 year old demon from a hell dimension. Angel is surprised hearing the name Kathy since it is the name of his sister.
* Angel says at first Doyle reminded him of Whistler. Buffy says she met Whistler (he was in Giles' apartment), he was the one who told her how to stop Acathla.
* Buffy meets Fred who says Angel rescued her from being a slave in a demon dimension. It makes Buffy think of the 7 people she rescued from a demon dimension when she was mourning Angel (he found out about her death right after getting back from Pylea). Both times it happened in LA. Fred fell into the portal in 1996, the same year Buffy was activated as the Slayer.
* Buffy visits Anne at the homeless shelter.
* Spike stops faking his death and tells Buffy he thinks he needs to stay in LA for awhile. He got his soul for selfish reasons and needs to learn how to be good for goodness sake.
* Buffy finds out both Angel & Spike had sex with someone else within the 7-8 months she last saw them. She can't be mad at Angel since she's been under a My Will Be Done enchantment (that time she was engaged to Spike).
* Buffy is the one to take the red sword off of Angel's weapons wall, the color reminded her of the Scythe.
* Angel, Buffy, & Spike fight together for the first time since Lover's Walk.
* Lorne tries to get Buffy to sing a few notes but she won't after what happened with Sweet and the town becoming a musical.
