About one hour and 7 minutes into the movie, when Neo is taken to see the Oracle and everyone is plugging in, Tank says "everyone please observe, the fasten seat belt and no smoking signs have been turned on, sit back and enjoy the ride." Now, at first this does not seem suspicious, but Tank was born in Zion, an underground city, he has never been in an airplane. I suppose theoretically, someone who use to be in the Matrix could have told Tank about what is told to the passengers, but why would Tank say it as though he "understands" the significance of this (i.e. using it as if he knows it)? This is nothing major but somebody who edited the script should have noticed this. Or maybe this will be explained in one of the sequels :)