When a vampire is staked and the weapon left in, it changes whether the weapon dusts when they do or not.
Throughout the series, most of the actors playing teenagers are actually in their twenties or older. This is a common practice in television for several reasons:
- It helps avoid child labor laws that limit how long minors can work on set and allows production to continue without interfering with real-life schooling.
- Casting adults provides more experienced performers.
- It gives producers greater freedom in depicting mature or sexualized content.
- It offers teenage viewers characters they can relate to and look up to.
During most of the fight scenes, it's obvious in some shots, that the characters are not the main actors who play them, but their stunt doubles.
In nearly every episode presented in widescreen, there is crew/equipment visible and/or revealing mistakes. This is because the series was originally shot for 4:3 frame and these issues would not have been visible as the show was originally intended to be presented. As such, one should take much of the goofs reported on episodes as being conditional on applying only to the widescreen alternate version.
Vampires like Angel and Spike never seem to be affected by the crucifix that Buffy is usually wearing.