A famous singer is being interviewed while shooting one of her music videos. In one scene, she actually jumps in a glass pool, which is supposed to be an aquarium in the video. Taylor's interview (see:10:33-10:43) After the reporter sees this scene completed, they hold an interview and she asks her:
The interviewer: Couldn't you just computer-generate this and not jump in?
Taylor: I don’t know. *(And to make sure, she turns to technical staff around and asks them the same question.) Couldn’t we have done this on a computer?
What drew my attention is that the reporter uses "could" for her question but Taylor uses "could have Past participle for the same question.
We know that "Couldn't you do this" and "Couldn't you have done this" have different meanings.
So, Taylor's using "could have past parcticiple" makes sense because that scene is now a past event. However the reporter was also there and saw the filming of the scene already finished. So why didn't she then just use the same correct structure "Couldn't you have done" but instead used "Couldn't you just.... "?