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: Because it's a kids movie that adults are supposed to be able to sit through as well. Seeing the horrific diarrhea mess would have too high a gross out value and be a turn off for the audience. It's better to leave it to the imagination than gross out your audience when that's not what you're wanting to do with the movie as a whole.
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