The mummified corpse in the chest seemingly turns itself around.
When they enter the exhibit for the Incan burial chamber, most of the sculptures are examples of Chavin art, not Incan art.
As Willow and Xander do a walk-and-talk across the front lawn of Sunnydale High, two crew members with lighting gear come into view in the background past Xander's left shoulder.
Explaining his costume for the cultural exchange party, Xander says: "I'm from the country of Leone. It's in Italy pretending to be Montana". But all of Sergio Leone's Western movies were filmed in Spain (mostly in Almeria region), pretending to be New Mexico (The Good, the Bad and the Ugly (1966)), Arizona (Once Upon a Time in the West (1968)), California, or Texas.
(at around 20 mins) Giles informs Buffy and Willow that the translated runes imply that the mummy is capable of feeding on the life force of a person, "effectively freeze-drying them." This is a mistake by Giles in making a comparison to freeze-drying as there is no freezing involved. The more accurate term Giles should have used is "dehydrating."