Inconsistency

The first time John talks to the guinea pig, guinny says that HE (talking about himself) understands Doctor Dolittle, like that's something new, like he couldn't understand him before...which would make sense...except the Orangutan speaks french...And later the guinea pig asks why do they call him that. If he didn't understand people other than John then he wouldn't have known that they called him that.
I can accept the fact that he talks with animals, i can accept the fact that every animal in the planet, except for humans, seems to speak the same language (well, the monkey spoke french, i have assume it was some sort of universal language of animals from france), but this one just bugs me.
I still liked the movie, i just hate it when little details like that appear and i can't stop thinking about them.
Also, i think someone asks him "did you just bark?" or something like that at some point...Does that mean that everytime he talks with an animal he Barks, meows, etc?
...it makes sense...
Nothing more.

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