Buffy the Vampire Slayer

Aldo and Willow were attempting to preform the famous duet from Puccini's Madame Butterfly. Willow was dressed to play the title character Cio-Cio-San and Aldo was playing her new American husband Pinkerton. In the actual duet, Cio-Cio-San does not come in until after Pinkerton's first five lines (where Willow asked if it was her turn). The first prompting look Aldo gave her was factually inaccurate.

At the beginning of the episode, an exterior shot of Sunnydale High is shown for a few seconds. This shot was taken from "Teacher's Pet" (1x04). You can see Willow sitting on the bench wearing her red shirt and plaid pants from when she first met Ms. French in "Teacher's Pet." However in the next scene, which takes place only a few seconds later, Willow is wearing a black and brown shirt and a flowered skirt.

Willow still has a picture of herself and Giles in her locker.

Willow has a Nerf Herder bumper sticker in the inside of the locker door. Nerf Herder is the band that made the opening theme for the show.

When Wendell says that he doesn't hate spiders and that in fact he loves them (spiders hate him), Xander asks "that's platonic right?" After the praying-mantis-woman tried to mate with him in Teacher's Pet (1x04), Xander may not consider this a rhetorical question.

When Xander reaches down to pick up the candy bar (just before the clown attacks), it appears to be a Hershey Bar. But if you look closely, you can see that the name has been altered. Both H's are gone, and the R has been changed to a P. The name of the candy bar is now "EPS EY."

After Billy wakes up, everyone obviously still remembers what happened over the last few days. Just moments before he wakes up, the hospital staff is panicking: yet immediately after he wakes up, you can see the hospital staff wandering through the hallways, as though it were a perfectly normal day. Unless Buffy and the Slayerettes only remembered because of their close proximity to Billy, that seems far too fast to get over such traumatic events.

Buffy's tombstone shows the dates "1981-1997." This birthdate contradicts both of the dates (1979 and 1980) from I Robot... You Jane (1x08). Ironically, this date (appearing, as it does, during a dream sequence) is more reliable than the ones mentioned previously, and is the one that seems to stick for the rest of the series. Also, this episode had to have taken place after Jan. 1st, 1997, because in the episode Witch (1x03) the sign in the gym says "1996 Cheerleading Tryouts."

It is unclear how the vampire Buffy made it to the hospital in daylight.

We learn that Giles can read five languages. On a normal day, anyway.

The Master's artificial thumbnail is visibly falling off in a few shots of the opening teaser.

In the beginning of the episode, when Buffy is talking to Willow before class, she closes her locker door. But seconds later, the camera cuts back to Buffy's open locker, and she closes it again.