Buffy’s mother Joyce met Hank Summers in her freshman year of college, when Joyce didn’t have a date and Hank did. She told this story to Buffy in 1.12 Prophecy Girl.

Buffy: …

When Buffy tells Tara’s family that “we’re family” in the episode 5.06 Family, both Joyce and Riley are missing. Both characters left the show later that season.

Buffy’s mother bought her daughter a long white dress for the dance in 1.12 Prophecy Girl (a sacrificial garment, if I ever saw one - what was Joyce thinking?!) Everyone comments …

Joyce tells Snyder in 3.02 Dead Man’s Party that she’s prepared to fight to allow Buffy back into the school. She says:

“If I have to, I’ll go all the way …

Joyce died of an aneurysm, which is coincidental as Kristine Sutherland’s own mother once had an aneurysm. Kristine believes that Joss Whedon wasn’t aware of it when he wrote the …

Aunt Arlene was Buffy’s aunt, and presumably Joyce’s sister. She lived in Illinois. Arlene was mentioned a couple of times but never seen on screen. In 3.19 Choices, Joyce called Arlene …

Brian went on a date with Joyce in 5.15 I Was Made To Love You, though he was never seen on screen. He sent Joyce flowers the next day, which Buffy …

The funeral of Joyce Summers was held in the episode 5.17 Forever. It was organised by The Brown Brothers Mortuary.

The episode 2.11 Ted was shot during Halloween. Many of the cast and crew came in costume to the set. Kristine Sutherland (Joyce) wore 50s clothes - dressed as Ted’s first …

In 3.18 Earshot, Joyce offers “chicken and stars” soup to Buffy. She also offers it to Dawn in the season five episode 5.13 Blood Ties, after Dawn discovers she’s the Key.

Giles and Joyce listened to Cream’s “Tales of Brave Ulysses” together in 3.06 Band Candy. In season five’s 5.17 Forever, the episode after Joyce’s death, we see Giles silently listening to this …

Joss Whedon admits that the final, low-key moment of 2.14 Innocence, in which Buffy and her mother watch an old movie on TV and celebrate her birthday with cupcakes and a …

In 5.16 The Body, Buffy tells Dawn about their mother’s death, though we don’t hear what is said. The following scene shows their dialogue, from the original script:

Buffy: “Mom died this …

In 3.02 Dead Man’s Party, Joyce says to Buffy,

“You can’t imagine months of not knowing. Not knowing whether you’re lying dead in a ditch somewhere or, I don’t know, living …

Buffy’s mother’s name - Joyce - is mentioned for the first time in 2.03 School Hard.

In 4.01 The Freshman, Buffy says “I hope it’s a funny aneurysm” referring to how her mother will react about the cost of her books. This is a foreshadowing of Joyce’s …

Buffy’s mother, Joyce, owns an art gallery. This is discovered in 1.03 The Witch.

Joyce saves her daughter in 2.03 School Hard by hitting Spike over the head with a fire axe. She reminds him of this in a hilarious scene when she meets him …

Whilst under the influence of the drugged 3.06 Band Candy, Giles and Joyce have sex on the hood of a police car. Twice. Buffy discovers this in 3.18 Earshot when she reads …

In 3.10 Amends we see that Joyce is not comfortable with inviting Giles to Christmas dinner after the events of 3.06 Band Candy, when they had sex.