Out Of Mind, Out Of Sight - S1-E11
Corrected entry: When Angel is speaking to Giles in the library about the book of prophecy, he is standing in direct sunlight through the window.
Out Of Mind, Out Of Sight - S1-E11
Corrected entry: In 'Out Of Mind, Out Of Sight' Giles says that it's a lack of people noticing her added to the mystical strength of the Hellmouth that turned Marcy invisible, but at the end of the episode it's revealed that there's a whole classroom of people who have turned invisible. How did all of them turn invisible without the Hellmouth's influence?
Correction: Though it appears to be a window due to the angle of the shot, it is in fact a square light, and it can be seen through an actual window that it is night time.