Agent Ward takes aim at a deer from a distance of 1800 meters with a TAC-50 rifle. The image of the deer almost completely fills his telescopic rifle scope. The scope he is using is not nearly powerful enough to magnify the image of the deer to that size.
After Grant and Buddy were in the woods for six months, Buddy looks very nicely trimmed and groomed. Grant's hair looks the same as it did at Juvenile Hall as well, but that could be a choppy cut he gives himself. The dog's grooming takes more specialized tools unlikely to be available in the woods.
When the harpoon is fired to get Coulson and May out of the building, it is fired into the ceiling. Those ceiling tiles are made of foam/ cardboard/ soft material and would not support the weight of 2 people. The harpoon would have also broken through it, but it stopped and became an anchor.