Visible crew/equipment: After Conan is set free from slavery he finds a cave where he removes a sword. When he climbs out of the cave you'll notice someone's hands near his feet pushing up his shackles. (00:29:25)
Visible crew/equipment: After Conan retrieves his father's now broken sword, it cuts to Doom's temple. In some versions the first long shot is a side view of the temple, with Doom standing alone on the balcony in front of the hanging tapestry. Then, in the next long shot facing the front of the temple, there's a crew member near Doom who is dressed in black, hunched over, standing beside the tapestry, and this person is wildly gesturing to come on up, just as a high priest walks up the long stairway (before his close-up). (01:56:35)
Answer: Like an Army Drill Sargent, he was berating them for not doing it better. Toughening them to become the best they could be.
Also, the other student laughs at Conan's punishment, so the teacher kicks him to teach him some humility.