When they dig Ralph out of the sand, he is facing downwards but after they start pulling him out he is suddenly facing upwards.
At one point Happy mentions 'precision guided munitions' from the Second World War. Though some PGMs were experimented with during the war the large majority of ordnance were 'dumb' and true PGMs did not come to the fore until the Vietnam War.
When the research plane is flying over, not one of the four adult geniuses, the child genius, nor the ex Marine thinks to use some form of reflective surface to signal to the aircraft.
Cell phone and Laptop batteries could never produce enough amperage to run a juicer.
When Scotty mentions he grew up poor in Mississippi, he mis-pronounces his hometown as "Bill-Ox-see" . Anyone from the US south/Gulf of Mexico area would pronounce it "bill-Ux-see".