 This effect is not particular to the "Buffy" DVDs but affects all television shows, because film that uses 23.976 frames per second is sped up for PAL that uses 25 (in the NTSC standard it is telecined and there is no speed variation).But since the signal from a DVD player is ultimately analog, the Region 2 and 4 DVDs will still play at the faster speed when played on an American television with a multi-region DVD.In Brazil the standard color system is not PAL, but PAL-M which is also 24 frames per second.