Time: 9:32 When Angel writes the type of demon on the whiteboard. He writes the type below the N. D. U. O. the Wesley wrote. But on the next scenes the N. D. U. O. is missing with no space where it could have been erased.
When Angel is snapping Prio Motu's neck, you can see a microphone at the top of the screen. This isn't a boom mic its a piece of wire or construction debris hanging down from the ceiling at Angel's right. Time stamp 15:02.
Cordelia asks Merl "the Snitch" if the cat's got his tongue, to which he replies he doesn't have a tongue. However when he is telling them where to find the demon they're looking for, he is shown to have a tongue while he is speaking. This can actually be both the truth and a lie. Merl is a very sarcastic demon. He may not have a tongue in the way human's have a tongue OR he could just be meeting Cordelia's sarcastic remark about cats with one of his own about tongues.
In the beginning of the episode, after the group enters the gym, you can see the group walking along a wall of mirrors and the camera is filming everyone's reflection in the mirrors except Angel's. However, David Boreanaz can be seen in a mirror on the far right of the screen waiting to join the scene. The group then walks together into the shot.
After Angel defeats the demons in the gym, a mirror catches his reflection.
Angel's crew enter in a gym. Immediately after showing a series of images where is clear that Angel produces no reflection, he kicks one big mirror; for a few frames, the foot's reflection is visible on the mirror.
When Angel is jousting in the street, some of the wide shots reveal the road has been cordoned off, and cars getting too close are signaled away by crew members/police.
As Angel climbs onto the horse, the camera from the previous shot can be clearly seen in the bottom right corner of the screen.
When Angel is fighting the Prio at 15:22, you can see someone in a blue short sleeved shirt to the right side, probably one of the crew members.
At time stamp 37:15 you can clearly see the camera in the bottom right hand side as Angel is getting on his horse.
At around 14 minutes, just before the scene cuts away from the Karaoke bar, Cordelia is shown with her mole in the left cheek, which may have been a mirrored shot as the mole is supposed to be on her right.