When they first show Buffy’s basement in 2.10 What’s My Line? (Part Two), and everytime thereafter until season six’s 6.04 Flooded, the stairs leading down are solid concrete. But in 6.17 Normal Again …

The front door of Buffy’s house changes in different episodes. In the season one episode 1.07 Angel, when Buffy is trying to close her front door on The Three, you can …

Buffy’s house was orignally shot on location, but was later built on a soundstage to make filming easier. Changes can be seen in the original and rebuilt house:
In The …

Scenes at Buffy’s house were originally shot on location, but later the interior was re-built on a soundstage. The location used for the exterior of Buffy’s home was 1313 Cota …

We see in 7.03 Same Time, Same Place that Buffy has moved into her mother’s old bedroom and Willow is now sleeping in Buffy’s old bedroom. Previously, Willow and Tara had …

Buffy doesn’t seem to lock her doors. In 7.03 Same Time, Same Place, Willow just walks into Buffy’s house through the back door whilst Buffy is out. In a place like …

We know that Buffy lives at 1630 Revello Drive. When Joyce is talking to the police officer in 2.22 Becoming (Part Two) the door is open and you can see the …

Buffy’s rejection letter in 6.15 As You Were is addressed to 1630 Crestview instead of 1630 Revello Drive.