Illyrea shoves Wesley and his desk against a window and the blinds are closed. In the next shot as she leaves his office the blinds are open.
When Illyria and Spike are "training" Illyria pushes Spike and he slides backwards a few feet. In that scene you can see the sand on the floor that enabled the actor to slide. In the next scene the sand is gone.
At 36:55 you can see Amy's contact shift, in her right eye.
(at around 8 mins) When Spike and Illyria are training, Illyria throws spike across the room against a mirror where a crew member is briefly visible right before it goes back to a wide shot and Angel asks for Spike over the intercom.