Here is a couple great ones, first an Introducing Intellivision commercial which seems to highlight the keyboard componant proclaiming all the things you will be doing with it which it seems didn't pan out like that:

Intellivision® TV Commercial: Introducing Intellivision

Next George Plimpton answers the wish of a child trying to convince his dad to get an Intellivision LOL! He does so by announcing the cheaper INTELLIVISION II!:

Intellivision® TV Commercial: Intellivision II:

Just type Intellivision into Youtube for a treasure trove of related material, hell I could watch all day!

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Oldschool games, some people just don't "get it"...