It is a "16mm" end of film look, or something like that.
It's a combination of flashes of light (use levels) and color correction of the image to bring that to orange tones (use a Photo filter or Colorista to do that). Of course it involves animating the above to "flash" a few times before a transition/cut.
Sometimes you can ad a 50-30% orange layer on top and animate some feathered masks to create some "blobs" of color that grow over the image.
I'm sure you can find some good tutorials if you google it, but that's my way of doing it.
You could also buy some "film flash" or "light leak" stock footage and experiment with different transfer modes and opacities.
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