when blackout land on the ground, you can see the twilight.
then suddenly, it is very dark night.
when sam and mk get in the bumblebee's body, It is still morning.
not only that sam says to mojo "It is too early to bark"
It means that they ran away from barricade at least for 2 hours.
look at the watch on the dam when venachek? and simmons, sam meet each other,
about five minutes passes while venachek is talking one sentence.
number4.It was very hard to find.
you remember the last scene? optimus talking on the hill with his hands in his side.
look at the optimus' exhast pipe.
It is dented, you can see the dent on his pipe, and suddenly it vanishes.