The following line was deleted from the episode The Freshman:
Sunday (about Buffy’s Class Protector award): “What better way to say, ‘I am the very most of geek.’”

Xander’s excitement over the explosion at Sunnydale High in Graduation Day (Part 2) was deleted from the episode: “Guys, we blew up the school! It’s the best day ever!”

This conversation was cu from the episode The Prom, due to length:
Giles: “Fine. You’re all suffering from a touch of spring madness, if you ask me.”
Oz: “Mine is more space madness. But I’ll feel better once I get used to the weightlessness.”
Willow (to Oz): “Promise me you’ll never …

The stage direction for when Buffy sets off the alarm in City Hall in Choices was: “She grips the box, lifts it off the table and… WHOOP WHOOP WHOOP (there it is) AN ALARM BLARES!”

In the original scene of Buffy fighting the telepathic demons in Earshot she said, “Say ‘Uncle.’ Oops. No mouth.” This was deleted from the episode in it’s final cut.

This conversation between Buffy and Willow was deleted from the episode Enemies:

Buffy: “I can’t stop thinking about that demon.”
Willow: “‘Cause of him being chopped up into little bits and all?”
Buffy: “Yeah, Will, let’s keep bringing on the visuals.”

A few lines were cut from the episode Doppelgängland:

Devon: “Hey, man, how’d you like to be our roadie?”
Angel: “Less than you’d think.”

and

Xander: “It’s all my fault.”
Giles: “What makes you say that?”
Xander: “I don’t know…Statistical probability.”

The episode Consequences had the following conversation between Angel and Faith cut:
Angel: “You and me, Faith, we’re a lot alike.”
Faith: “Well, you’re kind of dead…”
Angel: “Like I said. A lot alike.”
Faith: “Sorry, buddy. I’m alive and kicking. In fact, I’ve got a bodily function that needs attending …

This line of Buffy’s to Faith was deleted from the episode Bad Girls:
“I know you think you can handle this. And you’ve gotten used to being on your own. You’ve got your tough loner act down pretty well.”

Jack O’Toole’s line, “That’s it. No way am I bringing him back after I kill him” was deleted from the final cut of the episode The Zeppo.

This exchange between Buffy and Willow was deleted from the episode Helpless:
Buffy: “I mean, there’s a plus side to being a regular girl. The whole not-bleeding-and-killing-and-dying experience.”
Willow: “As for example.”
Buffy: “Then there’s buying outfits without worrying if they’re good for bleeding-and-killing-and-dying in. There’s a lot of good …

The following conversation between Amy and Willow was deleted from the episode Gingerbread:
Amy: “Oh, God, and Mr. Nyman that thing he does with his face…”
Willow: “The thing with the face! When he makes a point, the – I always think he’s going to sneeze!”
Amy: “I thought I was …

The exposition about Anyanka was changed in the episode The Wish. Giles’s original story of her ran as follows:
“Anyanka raised a demon to ruin her unfaithful lover. The demon did her bidding – but then cursed her and turned her into a sort of patron saint for scorned women. Apparently …

This line of Willow’s was cut from the episode Anne:
“Oh! That reminds me. I asked around about Andrew Hoelick, our gymnastic vampire, and apparently he used to like to hang out in Hammersmith Park and pick up grilles! Or, okay, that could be girls.”

This exchange between Buffy and Kendra was deleted from the episode What’s My Line? (Part 2):
Kendra: “Your English is very odd, you know.”
Buffy: “Yeah – it’s something about being woken by an ax. Makes me talk all crazy.”