The day after Joyce’s funeral in 5.17 Forever, Willow, Tara and Dawn are in the girls’ dorm room. In the long shot of the scene, there seems to be a man …

In vampire mythology (and the Whedonverse), a vampire cannot enter a person’s home unless it has been invited. This is first seen in the Buffy episode 1.07 Angel:
Angel: “It’s all right. …

We first learn that vampires can be killed by direct sunlight in 1.02 The Harvest, when Buffy says:
Xander: “So, what else?”
Buffy: “What else what?”
Xander: “For vampire slayage.”
Buffy: “Oh, fire, beheading, sunlight, …

In 4.14 Goodbye Iowa Adam puts a second floppy disk in his drive without having taken out the first disk.

Holtz sings the lullaby ‘All Through the Night’ to his daughter in 3.09 Lullaby. This is the English version of the Welsh folksong ‘Ar Hyd y Nos’. The only problem is …

While on the computer in the Social Services office in 6.11 Gone, Buffy types “All work and no play makes Doris a dull girl”. We see the ‘B’ and ‘F’ keys …

In 1.03 The Witch, Amy (in her mother’s body) is eating something when Giles and Buffy turn up at her house. When she puts it down, we hear a packet …

Why is Amy’s hair in 6.09 Smashed longer and lighter than before she became a rat? Her hair has even been styled differently.

When Amy talks to Kennedy and reveals she’s behind the spell in 7.13 The Killer In Me, her necklace is longer than it was in previous scenes.

Andrew reaches out and puts his hand on Willow/Warren in 7.13 The Killer In Me, but in the next shot, we see him just reaching out.

When Willow drags Andrew out of the butcher shop in 7.09 Never Leave Me, he drops his bag of blood on the floor. When she is pulls him out of the …

In 7.16 Storyteller, when Andrew walks away from the kitchen to talk to the camera, you see his shadow on the wall with an empty hand where the camera should be. …

When Andrew blows on his pan pipes in 6.05 Life Serial, the pitch incorrectly goes from low to high, though he’s blowing from high to low.

You can clearly hear Angel breathing heavily when he runs over to Buffy in 1.12 Prophecy Girl, but he then says he can’t resuscitate her as he has no breath. He …

After Angel has killed the vampires at the beginning of City Of, he turns and walks away. This shot is used at the end of the credits sequence in every …

When Buffy and Angel are kissing in 2.19 I Only Have Eyes For You, Buffy is holding Angel at the waist but then in the next shot she is holding her …

When Buffy finds Angel for the first time in 3.04 Beauty And The Beasts, he’s wearing just a pair of trousers. Buffy then chains him up, but when she returns to …

When Angel is talking to Buffy in 3.21 Graduation Day (Part One), he holds a box in two hands which changes to one hand in the next shot.

How did Angel get dressed so fast in between the time he woke up in bed and running outside in the rain in 2.13 Surprise?

In 7.22 Chosen, Angel says the First tried to make him kill himself (in 3.10 Amends) but it actually tried to make Angel kill Buffy. Angel decided to kill himself to stop …