Mischief City

Great, don't tell me it looks like Jacob Two-Two! But here is Maxine (who is more like Cyberchase's Inez). She appears once in "Flush-a-bye-baby". Earlier there is one teen-looking nameless in "Dust Bunnies in the Closet".

Gil & Julie

I have just found another obscure stuff I wanted with lost episodes in Arabic. There has four beach episodes and the first image was the series intro. Includes girls named Julie, Lucy (appears first) and Laura (appears second), but Sophie doesn't.

Manu

Look what I found! Here is the little 7-year-old sister Josiane appears where on the beach ("Tous à la plage"), then the last image of a picture from three years ago (last part of "Les Vacances à la montagne")

Schoolhouse Rock!

Here's the only thing wanted. It's in "The Great American Melting Pot". Those were children set in black and white.