Other mistake: When Ben gives Eddie Murphy the picture he drew of them, Eddie points out that Ben drew a green moustache on him in the picture, but when he looks at the drawing for the first time and also in the meeting there's no moustache. (01:00:25 - 01:20:20)
Other mistake: Many of the lines that Charlie reads from "Green Eggs and Ham" don't match the actual book. For instance, he says "Would you like to eat them here or there?" when in the book it states "Would you like them here or there"?. Also in the next line he reads "I would not like them anywhere" when it really says "I would not like them here or there, I would not like them anywhere".
Answer: When the kid goes up to Marvin and talks to him, he says "Klingo Mach" or something. That means "you speak Klingon?" Then the kid says "Egchad" which means "yes". That thing with the hands means hello or goodbye depending when you use it.