In the season two episode School Hard, Spike says Angel was his sire, which we discover was actually Drusilla in a flashback during the episode Fool For Love. The term ’sire’ seems to be loosely used by vamps.

In The Initiative, Spike said he was 126 years old. However in this episode, we discover he was vamped in 1880 which would make him about 6 yrs old when he was sired.

Considering they know the real risk of vampires, why do Willow, Xander and Anya show no common sense when they are patrolling with Riley? And why does Buffy let them go? I know they have had ‘field experience’, but vampires still have incredible strength and there is a real risk …

During Buffy’s fight with the invisible demons, there are several mistakes when we see Buffy’s point of view. The light above the door is low, but during the fight with the demons it’s brighter.The bench is on the right, but during the fight it’s in the centre.

Tara goes back to her dorm room where she sees her father. The only problem is - she moved in with Willow in Real Me and no longer lives in her old black room.

When Buffy meets Glory for the first time, she is thrown against a stone wall. In the shot where she falls from the stone wall, it clearly moves, proving it’s not real.

When the Scoobies are in the Magic Box talking about what’s hurting Buffy’s mother, Xander and Buffy are sitting side by side with Willow standing behind Buffy. The shot changes and Willow sits down next to Buffy… where did Xander go?

Spike’s reflection can be seen in the tin holding the penny.

You can clearly see Riley’s stunt double in the scene where he fights Harmony.

How did the Initiative doctor perform brain surgery on Spike without shaving any of his hair off? Or affecting his hairline in any way?

After Riley’s basketball game, the amount of sweat on his back changes in different shots.

Buffy’s stunt double can be seen clearly when she fights the vampires on the platform.

Buffy pulls herself out of the sewer water and her hair is almost instantly dry.

When telling Wesley about the three vampires she and Faith killed, Buffy says, “One of them had swords. I don’t think he was with the other two.” All three of the vampires were dressed in the same Eliminati uniform, so why would she think they weren’t together?

When Jack and Xander are facing off while the bomb timer ticks away, the timing is not correct. At one point, the timer says 00:11, but two seconds later (and the beeps are audible, so you can count the seconds easily), it says 00:12. Then, exactly when it should explode, …