I was watching Bullet Train and I noticed something very odd in the final scenes.
In the final scenes where Brad Pitt and Sandra Bullock something seemed off to me... Like they were filmed separately and composed together in post production. The light looks different on their faces, and when they look at each other it seems they're gaze is not aligned. There are one or two physical interactions between them (which could've been done with a stand-in and just replaced Bullock's face digitally) but for the rest of the shots I started thinking if perhaps she was filmed separately due to whatever reasons (conflicting schedule perhaps).
I have seen an interview in Entertainment Weekly where Pitt talks about having Bullock cameo in this movie while he would appear in hers, and there is an article on People with photos of them on the set... But that doesn't mean she was there for all the scenes.
Is there any evidence that points to Sandra Bullock not being on set together for all the scenes with Brad Pitt or is what I saw just the result of weird lighting / digital effects / something else?