Plot hole: When the crew's vessel gets stuck in the giant geode and the crystal jams the 'impeller', the magma begins to fill the chamber. They see it melting the crystals, yet they frantically continue working to free the crystal from the impeller and lose a crewman...and yet when they get back in the vessel, the magma indeed melts out the crystal that jammed the impeller. With 2 geologists onboard you would think they'd know that.
Factual error: When they realize they need to make the last nuclear explosion 30% bigger, they simply pull the fuel rods from the reactor and set them next to the bomb. This is ludicrous, a nuclear bomb is a carefully engineered piece of equipment, with carefully shaped charges imploding the radioactive material. Setting some fuel rods next to the bomb will accomplish nothing.
Factual error: When Becca is waiting to be called before the flight review board and while standing in front of the board she is wearing earrings that hang below the bottom of her ear lobes. Military regulations only allow small spherical conservative earrings centered in the middle of the ear lobe.
Factual error: In the very first shot of the movie David's watch shows an invalid time. If it were 10:30, the hour hand would be between 10 and 11. The hour hand is exactly at the 10:00 mark even though the minute hand is at 30 minutes.
Factual error: In a few shots through the movie the gauges or screens displaying information, they use "PPI" for pounds per sq. inch instead of PSI. PPI is wrong it's always PSI. The first time you see it is in the scene when they just launch the ship right before they pierce the crust with Braz and Serge for sure.
Factual error: While in the giant geode, the inflowing magma is referred to as lava. It is only lava when it is erupted onto the surface of the earth. In any case the mantle is nowhere near as liquid as is shown, it is almost completely solid. (01:05:30)
Deliberate mistake: During the crash landing of the space shuttle, its landing path is depicted as coming in from west to east, from over the ocean and coast before landing in the Los Angeles river. This course makes no sense. The way the landing is depicted in the movie, the shuttle is flying with downtown to its right, which would basically mean it's gliding from inland toward the ocean, or roughly the opposite direction of its initial approach. Yet the movie makes it seem as if was mostly coming down in a straight line with a slight turn to align with the river. In between the time the ship flies from over the ocean and finally touches down, it manages to fly over Dodger Stadium and disrupts a baseball game. Dodger Stadium is to the northeast of downtown Los Angeles and the flood channels where the shuttle lands. Further, the shuttle is shown flying from the outfield toward home plate, which, considering how Dodger Stadium is oriented, would have the shuttle flying north to south, perpendicular to a heading from the ocean toward inland. This is the real Dodger Stadium, and not a generic "movie stadium," as the Dodgers are one of the teams playing and the batter is Shawn Green, one of the real Dodgers players at the time. The only way the shuttle's movements make sense would be if it overshot the city completely, then made a sharp right turn to fly over the stadium before landing in the river, which is more or less south of the stadium. However, it flies over the stadium before mission control suggests a turn toward the river, and before there's any indication that the shuttle has deviated from a straight approach from the ocean toward the city (the mission commander is very worried about hitting the buildings). If the shuttle had enough time and altitude to basically turn around in its approach, it could have tried to aim for an airport or other landing strip within the city. The shuttle could have flown over Dodger Stadium from the ocean, but then would have had to land around Pasadena and not closer to downtown LA. However, in order to achieve a gag of the shuttle distracting the batter so he'd strike out, the shuttle had to come from the outfield; otherwise, the shuttle would have flown over the front of the stadium, so the batter would have had his back to it and wouldn't have been able to see it coming the way he saw it coming from the outfield, where there aren't as many structures to obscure it.
Revealing mistake: The underground crystal chamber is completely encased in a cobalt shell, yet a light source has to come from somewhere to allow all the crystals to reflect in the dark. The light from the ship wouldn't have been enough to make them all reflect and the magma had not yet breached the ceiling.
Factual error: When they land the space shuttle in the river canal, they are approaching too low, so the commander commands to retract the gear. That would be impossible, as the landing gear of a space shuttle is controlled only by gravity. The gear can't be raised again after being deployed.
Other mistake: At the end of the film when the carrier battle group is searching for the deep earth team the carrier captain is wearing a baseball cap which reads "CVN-72 USS ABRAHAM LINCOLN". In the credits he is described as "USS CONSTELLATION CAPTAIN" but in the acknowledgments it thanks the captain and crew of USS ABRAHAM LINCOLN. (01:55:45 - 02:03:45)
Plot hole: Beck is an Air Force pilot and an astronaut, Purcell is Army Ranger General. Neither military branch has no say in the actions of the other and Purcell has nothing to do with the space program. So why would he have any say or knowledge about Beck's review board about the shuttle accident?