When Connor and Abby are in the tree, when the camera pans to Connor you can see vehicles driving by on a road behind him on the right.
When the Embolotheriums first appear charging at the campsite, they are spread out side-by-side on a broad front. However, after Eve opens up the anomaly, they are running single file without visibly having changed formation.
When they look down towards the church the orange sports car is not there from their last visit.
No human could go back in time to wipe out the human race as then there would be no human to go back to wipe them out.
When Danny takes Helen's pulse to check that she is dead, she can be seen still breathing.