I 100% do not think stepmom was involved. I think it was a school staff or a parent or someone attending the science fair. They picked a very chaotic day which everyone is absorbed into the science projects. Try giving the teachers and the school staff lie detector tests and interviews galore.
I don't care about the kissing goodbye thing. I wave to my son when I'm leaving him. He doesn't want me to kiss him goodbye. It's crazy how over-analyzed things seem to get.