This episode ranked 6th out of 12 WB shows for the week.
An alternate title for this episode was "Invisible Girl". The one listed is the most commonly used title.
This episode scored a 2.4 in the fast nationals.
This is the first episode where Cordelia realizes that the paranormal really does exist, and it will lead her to get more involved with Buffy and her friends in future episodes.
Clea DuVall will work again with Sarah Michelle Gellar in the 2004 horror film, The Grudge.
The scene in the library between Giles and Angel is the first time the two charaters meet.
Principal Snyder: There are no dead students here... this week.
Giles: It's a bit of a puzzle, really. I've never actually heard of anyone attacked by a lone baseball bat before.
Xander: Maybe it's a vampire bat. (everyone just stares at him) I'm alone with that one, huh?
Xander: I would give anything to be able to turn invisible! Well, I wouldn't use my powers to beat people up. I'd use my powers to protect to the girls' locker room.
Willow: "Have a nice summer". "Have a nice summer". This girl had no friends at all.
Giles: Uh, once again I teeter at the precipice of the generation gap.
Buffy: "Have a nice summer" is what you write when you have nothing to say.
Xander: It's the kiss of death.
Cordelia: (to Buffy) I know that you share this feeling that we have for each other, deep down...
Cordelia: This is all about me! Me, me, me!
Xander: Wow. For once, she's right.
Cordelia: (to Buffy) Because you're always around when all this weird stuff is happening. And I know you're very strong, and you've got all those weapons. I was kind of hoping you were in a gang.
Giles: (about Cordelia being in the library) You know, I... I don't recall ever seeing you here before.
Cordelia: Oh, no, I have a life.
During the scene where Buffy and her friends are having lunch, Xander alternates between eating a sandwich and then to not having a sandwich as the shots change.
When Buffy tries to save Cordelia from Marcy and falls, she lands on her back and rolls over on her side. However in the next shot she is still shown lying on her back.
Cordelia: My eyes are hazel, Helen Keller.
This is a reference to Helen Keller, a girl born in 1880 who by the age of 2 was both blind and deaf. Thanks to an extraordinary teacher, Anne Sullivan, Helen learned to communicate and speak and went on to live a long healthy life, living 88 years.
Buffy: It's pretty much "Crush! Kill! Destroy!"
This is a reference to a robot in the 1960s sci-fi show Lost in Space, who is famous for using that line. Buffy uses it to imply that monsters aren't exactly known for trying to send messages.