We can assume that the plot is accurate; a retired opera singer makes a will that demands that her cats inherit all she owns, and her butler tries to get rid of them. We can even assume that there's some form of communication
between the cats, and they meet an alleycat who becomes their father figure. However, certain details are different. Napoleon and Lafayette, who do end up stealing Edgar's distinctive hat and umbrella, have far too human-like gestures to go unnoticed. Rather than grabbing the bowler with his paws when Edgar tries to steal it back, Napoleon probably snatches it in his mouth.
- There is actual evidence for this, although it may be an animation goof. At the end of Everybody Wants to Be a Cat, the cats pile onto a piano that crashes through the building, and they walk out playing broken instruments. However, the instruments are in no way damaged during the fall, so this seems strange, unless you assume the animation of the piano falling through the floor was just a representation for the actual crash.