I remember noticing this in the theater but it was noticed much more now that I can analyze the movie a bit in my home. Starting with the first act and continuing through the movie it seems to go from about 3 pm or maybe 4 pm to like 9 pm in 10 minutes. I'm not hating the moving because of it, but I wonder if its Bays way of being able to not show as much detail or save on cgi costs. I would imagine that the barricade/bumblebee fight would have cost more to shoot in day light because of the amount of detail he couldnt hide in the dark. Starting from the very beginning of that whole sequence where Sam gets up and tells Mojo to stop barking because its to early to the end of the fight seems to only happen in maybe an hours time. Just a thought..