Go to the part where Spider-man stops the train from crashing off the end of the track. After he finally stops the train, he is worn out - no doubt. It shows him start to fall, but people catch him. A close-up shot shows a hand on his (Spider-man's) right shoulder, a hand on his left shoulder, and a hand over him on his chest. But right after it shows a wide shot, only the hands on his shoulders are there! Watch it, it's noticeable.