When Spike hits Robin, the cable can be seen that pulls Robin across the shed.
When Buffy and Giles are in Wood's office, they are talking to one another, however in their respective close up shots, they are both looking right which would mean Buffy is looking at Wood while talking to Giles and Giles is looking at the back of the room while talking to Buffy.
When Buffy goes to Robin Woods' office to tell him everything is still normal in the school , a crew member can be seen to the left of the screen.