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Shortly after Buffy's crossbow bolt hits Vampire Xander in the shoulder we see Xander and Willow together (when Willow says that the Puppy got out) and there is no visible injury to Xander's shoulder.
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After Anya grants her wish, Cordelia's hairstyle changes. In the real world, it was teased up in the front, but after the world changes, it's styled so that she has a part in the front and is less voluminous.
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Even in this alternate reality, the prophecy mentioned in "Prophecy Girl" is fulfilled: "The Master will rise, and the Slayer will die."
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When Harmony and the other Cordettes turn around and berate Cordelia for her comment about going to the Bronze, an overhead microphone can clearly be seen.
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When Vamp Xander drops Cordelia's body after he and Vamp Willow kill her, there is no sound of the body hitting the ground, yet when Vamp Willow drops the key of the book cage on the ground seconds later, the sound of it hitting the ground is loud and clear.
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When Cordelia is attacked by vampire Xander, as she is thrown down on the street you can see that she (actually her stunt double) has flesh colored knee pads covered by matching hosiery to help hide them.
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When Harmony suggest dating Jonathan as a way of insulting Cordelia, she must not know that the two actually went on a date in the season 2 episode
Reptile Boy (2x05).
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When Cordette #1 is drained on the machine, we see a set of rather large looking needles impale her. They must be fairly big because they do drain the blood out of her fairly quickly. However, when they retract from her body, not only are there no bloodstains on her from the punctures, but her top doesn't even have any holes in it!
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When Buffy stakes the vampiric Xander, it's pretty obvious that the stake hits him in the chest and the point slides down a bit.
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If all of the Sunnydale residents know enough to wear dark clothes to not attract vampires, then why don't they know enough to carry around huge crosses like Giles does?
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It would seem that Giles's book is mistaken. Destroying a vengeance demon's power source seems to most likely just revert the last wish they granted.
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Notice that when Cordette #1 was put on the tray, her arm was folded across her stomach. The next time the camera is shot to look at her, her arm is lying down at her side.
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When Cordelia and Anya are talking inside the school you can see a girl by the stairs in the background waiting for her cue to start walking.
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In Oz's and Willows first scene, if you look behind Oz a couple of times, you can see the same student walk past them (white shirt, black bag), and once nearing the end of the conversation, although you cant see more than the shirt, it looks like the same student is walking past for a third time.
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Cordelia cuts off the picture of Xander right up to his chin, but the picture we see burning is cut much lower so that you can see his chest.
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During the scene when Cordelia has recently been put in the new reality, she is talking with her group of galpals about going to the Bronze. A boom mic can be seen briefly during this scene above the girls.