Plot hole: In the scene where Lewis and Clark nearly hit the Event Horizon, One of the crew is calling out the closing distance and another confirms this information. Regardless of clouds obscuring their view they were aware of their proximity and the fact that they were speeding towards it and forced to attempt an abrupt stop makes no sense.
Plot hole: The use of massive explosives to separate a ship makes no sense as the explosion would send fragments at high velocity in every direction guaranteeing it would penetrate whatever ship is remaining. As we see in the final scene when the ship does blow apart, it is not a precise controlled detonation to sever connections but a total (and glamorous) explosion which makes no sense whatsoever.
jerimiah
Chosen answer: At least one crewmember is seen as a floating, frozen corpse on the bridge of the ship when the rescue crew are exploring, there is also evidence seen that a significant amount of tissue and blood have been spread around the walls in some parts of the ship, however it is implied that the original crew are in the alternate Hell dimention, if not physically then spiritually.