(at around 47 mins) we have All the lights are on in an exterior night shot of the large house where the family lives. However, the next interior shots show the family with candles and even a flashlight is used.
At 45:26, when Karen is giving her input into lake formations she is stepping out of the lake at 45:42 in Croc style footwear, whilst in the shot after at 45:52 she is running away in Converse style footwear. The Converse were worn in prior scenes also.
When the cruise missile is launched it targets the Kola Superdeep Borehole. Well it would be physically impossible for a cruise missile to travel down the Kola Superdeep Borehole because it is only 9 Inches wide. There is absolutely no way for the most powerful nuclear warhead to travel down a 9 inch wide hole.
Dr Ranger suggests the usage of the MK 80 Nuclear Warhead (MK is pronounced 'Mark' in Military designations) the largest nuclear device the US has. The Mk80 is a fictional name and does not exist. The B81 or Mk81 however is a factual name, but it is not the largest Nuclear Device the United States has or created, the B41 or Mk41 Is the largest Nuclear weapon the US Created.
Dr. Ranger suggests to detonate the worlds largest nuclear warhead the MK-80 ( fictional by the way ) down the Kola Super-deep Borehole. This would be impossible as the Kola Super-Deep Borehole was sealed shut and it is literally a 12 inch wide welded shut steel cap head that seals the 9 inch wide hole. The Kola site was sealed shut in 2012.