Charlie Wilson's War

I watched "Charlie Wilson's War" for the first time last night, and a scene that struck me funny. There is a scene where Wilson was sitting at his desk and there is a big orange tabby cat lying on a corner of the office. One of his assistants arrived and located next to the office and chat. In the next scene, a second assistant enters the office, but the cat is gone and is never seen in the film. What happened here?

it was an accident "in a movie. I'm sure there is a technical term for this, but I can not remmeber now.
basically it's a detail the director did not pay attention during the assembly "or final assembly before releasing the film.
there were probably other scenes with the cat at the outset but they STV film for time reasons.
you know one when a film is shot, it is much longer than what you see INA dvd or theater, but the change in length and budgetary reasons and because they will be cut only affect the history.