Ive analysed the opening two minutes of bad teacher and they use a variation of techniques such as the close up shot to show the expressions of all the teachers when they hear about elizabeth leaving they also use the long shot which shows elizabeth scurrying off behind all the tecahers when they are celebrating a birthday and when the little girl is crying this sets up the audience to show what they are to excpect from elizabeth they excpect that she will be what is in the title. They also use didgetic sound of the ringing bell to signify the end of elizabeth's career or so we think ! They use a upbeat tone at the start to show elizabeths personailty