In the final fight scene between Hamlet and Laertes, and after Laertes' sword's point is tampered with, Hamlet it scratched on the shoulder with Laertes' sword. The scratch is about 1x2cm and northward in direction. Later on, when Hamlet's shoulder is seen, his scratch is much longer and thinner and runs the length of his shoulder.
When Laertes is shouting at Claudius on his return it is shot from two angles. From Claudius' view Laertes' sword is pressing against his neck and he pushes on it as he speaks, but from Laertes' view his sword is not touching and he waves it slightly as he speaks.
After Hamlet speaks with his father in his woods, while he runs and is met by Marcellus and Horatio, there is a quick pan shot in the woods where you see a ladder covered by a long board on the ground.