"Mesdames et Messieurs !" (as in "je vous présente" okay, that is not real natural, but he has fun with it)
"Bonne nuit, Maman" (of course, that could come from us repeating it since he was born)
"J'arrive... Papa et Luka arrivent... etc."
"Je ne sais pas quoi faire."
"S'il te plaît..."
"Ma petite maman." (Not sure if this one is from T'choupi, but it sure is cute."
... I know there are some others that I am too tired to recall right now - however, I just thought it was interesting, that in this case, TV (or more correctly DVD's) are very helpful in providing a forum in which French is spoken in a true French context (product) from which he can learn to speak more natively/fluently.
For more on my musings on raising kids bilingually, see my corner at our web site:
http://www.bodeuxinternational.com/per/Eve/Eve.htm.