Continuity: Buffy's birthdate starts at 1979. In "I Robot, You Jane", when the demon pulls up Buffy's file in the school system, it shows her year of birth as 1979 and that she is a senior. But when her file comes up on the student's computer screen, its changed to 1980 and sophomore. It wasn't until towards the end of season 1 in "Nightmares" that her birth year is 1981 (on her tombstone before she comes out as a vampire.)
Buffy The Vampire Slayer (1997) - 2 mistakes in "I Robot, You Jane"
Directed by Joss Whedon, starring Alyson Hannigan, Amber Benson, Anthony Head, Charisma Carpenter, David Boreanaz, Emma Caulfield, James Marsters, Marc Blucas, Michelle Trachtenberg, Nicholas Brendon, Sarah Michelle Gellar, Seth Green (add more)
I Robot, You Jane (series 1, episode 8)
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