One flashback sequence dealing with bullying of Tinius has the boys wearing only their swimwear.

Several moments of Tinius being bullied by a group of bigger boys, with the narrator telling about what the boys do with him.

Barely some mentioning about someone who had passed away.

A flashback scene taking place much later has Tinius forced by a group of other boys to punch a boy who is bleeding from his nose. Tinius' fist is seen coming closer to the screen before the flashback ends there.

An elderly lady falls ill, but gets much better after a while.

None.

Almost no smoking.

For the most, none. But the flashback part that has Tinius forced to punch a boy with nosebleed could be little bit disturbing, although the whole series only consists of book illustrations.