Continuity mistake: Spider-Man falls on a puddle and looks at the wall in front. There's a window to his right, barely a metre from the floor, and an emergency staircase on the left. When he starts climbing, the staircase disappears and the window is now 10 metres above the ground, on the left side.
Continuity mistake: In the train stopping scene, Spider-man's suit begins to rip on the left arm under the strain. For several scenes after (all during the train sequence) this particular rip disappears and reappears at different times.