cool things in Baby Driver that went unnoticed

I'm not sure what you noticed and what you didn't, but I'll give you a few things that were a little obscure but really cool.

1. Music synchronization- K, so I'm sure you noticed that the movie was extremely well coordinated with its soundtrack. Gunfire, footsteps, and even background noises like police sirens were timed to match the music perfectly. But what you night not have noticed, and what it took me two viewings to fully appreciate, is that even voices and other songs playing in the environment matched Baby's neverending score. In the scene near the beginning when Baby walks down the street to get coffee, he passes someone talking on the phone. But what's incredible is that the tone of voice of the man matches the background music. His voice changes pitch and rhythm ever so slightly with the song. And when he leads police on a chase through a shopping mall, he stops in an area with loud rap music playing. Even the song playing in the background matches the rhythm and pitch of the song in Baby's ears. The work that must've gone in to that level of synchronization is incredible.
2. Transitions- From an audio standpoint, Baby Driver was mind blowing. But it was also beautiful and well done from a visual perspective. Some of the scene transitions practically me made me squeal in my seat. My personal favorites include the fade in to the laundromat scene where we're shown Baby's and Deborah’s feet tapping in perfect time with the song they're both listening to, and the transition from that scene to Baby's apartment. The way they turned the spinning washing machine (filled entirely with red clothes) into the red colored center of a turning record was magnificent.
3. The rainbow- The simple yet brief appearance of a rainbow over the picturesque country landscape outside the prison when Baby is released thrilled me. I know some people don't like the ending of the movie, but those people are wrong. The ending gave us a happy conclusion to Baby's love story while still maintaining a realistic and positive character. Baby faced the concequences for his actions, and that's a good thing. The rainbow conveys all of this. In fact, I consider the rainbow to represent the central theme of the whole movie. You see, at some point in the movie, Deborah (at least I think it was her) mentions a Dolly Parton song with the lyrics “everybody wants happiness, nobody wants pain, but you can’t have a rainbow without a little rain.” So when we see a rainbow floating over Baby's release from prison, we know that the rainy part of his life is over. We are meant to understand that, although Baby's had an unfortunate and dangerous past, he's finally gotten to a point in his life where he can be happy. He has Deborah, he has Joseph, he has a fast car, and he has his music. He's dealt with the rain, and he's ready for that rainbow.

Baby Driver is a masterpiece. Everything that comes up onscreen or through the speakers serves a purpose. I hope I was able to help you appreciate the movie a little more.