Sorry, yeah OK these clips probably show how a real corporal punishment would have happened. But really he caught her looking at the test answers and all he did was give her a spanking? Surely that would have been a canable offence?
When using a stinging cane, and this is generally recommended due to its unparalleled educational effect, a punishment will only be effective if it leaves clearly visible marks, that is, the typical double, strongly reddened bumps. Otherwise it is a deception.