In a close-up of their hands, Glory crushes Tara's hand to the point of blood pouring from many of Tara's fingers and onto the bench. A few shots later - cut to a two-shot of Glory & Tara and there is no sign of blood on their hands or the bench. Then Glory raises their hands and there is only a little dried blood. This probably was done to get past the censors. Shows often have to remove the amount of blood and guts in order to get an approval to air.
Giles states that Anya was "born here, your mortal self". This is factually inaccurate. Anya was actually born Aud in 860 in Sjornjost, Sweden.
Buffy finds Dawn standing in the middle of a triangle made by Anya, Xander, and Willow, so accuses her sister of lying when she tries to explain it's her geometry homework - but in fact their heads are the four vertices of a regular tetrahedron.