During the Credits (spoilers)
At the start of the credits there is an extra scene showing the morticians laying flowers on the babysitter’s grave. They comment on how she left them money and that they should go to Vegas as the camera pans down to show the headstone that reads “Nice Old Lady – Died of Natural Causes” which is what the kids wrote on the box they left her in at the funeral home.
After the Credits
There are no extras after the credits of Don’t Tell Mom the Babysitter’s Dead.