Dawson Casting: Notably Averted: The character's stated and implied ages were reflected by the actors who played them, bar some exceptions: the actors who played Alice and the Guardian were in their late 20's.
The Danza: Ryan, though as it's most likely just a coincidence seeing how he's no more prominent than most of the characters.
Executive Veto: The executives refused to allow smoking to be shown. This was the only thing that wasn't allowed. This includes prostitution, slavery, underage drinking and attempted rape.