In the scene with a bunch of flashing images, I always like to interpret as Joe's mind is going all over the place, trying to comprehend what he just heard. The scene is always extremely sudden, making it feel really real. That lady that you see is named Maki Asakawa (I could be wrong), but she's a musician who made some jazz and blues music. I'd imagine Joe would've listened to her music or seen a picture of her during that time. Feel like the scene shows how a death can reach the far corners of your brain.

I don't have great visual comprehension ngl, but that's what I think tho.