"An' listen Mickey, if y' dead, there's no school, is there?" Linda to Mickey when Mickey is upset about being caught swearing without having crossed his fingers
This shows childhood innocence in two ways. Firstly, they believe swearing without crossing your fingers will mean you go to hell which is most likely a superstition learnt from their mothers. Secondly, the fact they prioritise no school upon death as their comfort is innocent as that is their biggest concern in their life. This moment also is foreboding as it suggests they are later going to have much greater matters on their hands, and ultimately be dealing with death.