Buffy The Vampire Slayer (1997)

This Year's Girl (1) - S4-E15

Plot hole: When Buffy is giving chase to Faith, Faith jumps over a wall. Buffy then looks over the wall to an open field but can't see Faith anywhere. There is no way Faith would have disappeared in that short of time in an open field like that. (00:27:00)

oobs

Primeval (2) - S4-E21

Plot hole: Willow hacks into The Initiative's computer system and discovers air ducts and electrical conduits leading to Adam behind 314, but the room doesn't show up on the schematic. It seems unlikely that nobody who didn't know about Adam would have noticed this and investigated.

THGhost

Into The Woods - S5-E10

Plot hole: How did Buffy know where to find Riley at the end of 'Into The Woods'? He told her he was leaving with the army, but he never mentioned the helicopter pad. (00:40:30)

Shay

Into The Woods - S5-E10

Plot hole: When Buffy talks to Xander at the end and he tells her to stay with Riley, she mentions that he is going at midnight. But earlier in the episode, Riley doesn't tell Buffy he is going at midnight, he says "Transport's leaving tonight" first, and at the end of the conversation he says "Unless you give me a reason to stay, I'm leaving tonight". Nowhere in this episode does he tell Buffy that he's leaving at midnight.

Life Serial - S6-E5

Plot hole: In the 3rd time loop at the magic shop, the woman looking for the mummy hand looks surprised when Buffy knows what she wants. In the 2nd time loop, the woman tells Buffy that she called the shop 20 minutes earlier and was told that they had one. Therefore at least one of the shop's staff would be aware that a woman would be arriving looking for a mummy hand.

THGhost

Gone - S6-E11

Plot hole: Nobody notices a strange girl (Willow) with a invisibility ray-gun floating next to her talking to four invisible voices in a public arcade and only start to react when a fight breaks out.

THGhost

Gone - S6-E11

Plot hole: For some strange reason, the guard at the arcade allows Buffy and Willow to leave the arcade with the invisibility ray-gun despite having absolutely no idea what it does.

THGhost

Lessons - S7-E1

Plot hole: The First (as Drusilla) touches and moves Spike's hair, However it is made very clear later in the season that The First is not corporeal, which means it is unable to physically touch anything.

Bring On The Night - S7-E10

Plot hole: When Andrew wakes up, Anya mentions the First posing as Warren to make him kill Jonathan. Jonathan's body hasn't been found and the only time Andrew became ready to talk, he was knocked unconscious. They shouldn't have a clue about Jonathan's murder.

Bring On The Night - S7-E10

Plot hole: When the First has the Toruk-Han torturing Spike it hold his head under water. Hardly torture seeing as Spike is a vampire and doesn't breathe.

Get It Done - S7-E15

Plot hole: When Dawn and Buffy discover Chloe hanging in the bathroom, Dawn gives a little gasp but nothing more. But, seconds later, some Potentials run from across the hall saying "What is it? We heard -" before they see Chloe. While it suits the next scene to have them there, there wouldn't have been any sounds loud enough for them to have heard from across the hall through a closed door.

Shay