When vampire Xander catches and throws the fleeing Cordelia (or rather, her stunt double) to the ground, the wrinkled material of the skin-colored leggings protecting her (supposedly) bare legs is clearly visible.
From 17:09 to 17:11 when Cordelia is speaking with Harmony and the other Cordettes, a boom mic is visible in the center of the shot.
While Anya and Cordelia are talking before Anya gives Cordelia the necklace, there is a girl in the background who stands still, unsure of what she's doing before then moving.