Continuity mistake: In the scene where Rose and Cybil are trapped in the small room and Pyramid head is trying to get in right near the end of the scene Pyramid head starts bending the pole. As the angle changes from below to the front, the pole is bent far higher than it was when he first let go of it.
Continuity mistake: When Rose first enters Silent Hill, she is forced to use a Zippo lighter to illuminate a series of darkened alleyways. However, during the course of the scene, the flame gets larger, to the point it is almost like a torch. While Zippo lighters do have adjustable wicks to make the flame smaller or larger, we never see Rose adjust the wick, nor is there any time for her to adjust it off-screen, as the scene is in real-time.