I wouldn't say this is a downside, but it is kind of convoluted storytelling. From my review:

Without any explanation, McGarrett, Danno and Kono are seen running under the runway in a tunnel to the building where the hostages are being held, only to find that at one point it is completely blocked. A guy from the airport accompanying them explains: "A couple of years ago, we started to demolish this section. We were gonna clear it for a runway, but then the plan was dropped … There's 20, 30 feet of this." This is particularly dumb, and sounds like the show was running a bit short, so they added in this extra material. The three Five-O men rush back in time to the tunnel entrance, wherever that is, and then somehow sneak up on Hampton and his two hostages through the back door of the building.