After having read comments from teachers whinging about demo lessons, I am beginning to understand why schools look down on many western "teachers"! I have spent 30+ years "edutaining" here in Thailand and now, in retirement, mainly spend my time recruiting people, many of whom have no knowledge, no experience and no interest in teaching. Their only interest is in getting as much money at the end of each month whilst, doing as little as possible since the last payment.
Demo lessons are there to try and exclude the weeds (of which there are many) from the flowers. The demo lesson is held to establish the following;
Is the applicant able to show confidence to the student?
Is the applicant able to keep the class interesting?
Is the applicant able to keep the attention of slow learners?
Is the applicant just babbling on at the interview stage? (Many do!)
Does the applicant have any understanding of the subject he is teaching?
Can the applicant show any empathy with the student or, is he or she, too busy with his or her own thoughts?
For newbies, that is all you need to know and concentrate on. Don't listen to other opinions, or your future written resumes will show what a useless teacher you really are. How? By your never being offered a second contract at the same school!