Jill Kerman's character Penny Wheeler meets Bernard Hedges for the first time here - by the time of the cinematic release she had actually already appeared as the character in the third season of Please Sir! (1968) on TV, during the 1970 run. The pair would eventually marry in the series.
The plan is to send 35 pupils to the summer camp. These would fit on one bus, but on the day of departure two buses are used, and an enormous number of kids appear to be going.
Eric Duffy: All right, the experiment has worked with us, but we're just kids. I still maintain we can get more significant results with a mature, intelligent, adult.