(at around 4 mins) During Fin's medal presentation, an American flag is hanging in the background. In some shots, it is hanging correctly with the blue field on the left while in other shots, it is hanging incorrectly with the blue field on the right.
(at around 1h 1 min) When Fin is putting on the Astronaut suit, the "Remove before flight" tag keeps appearing and disappearing throughout his dialogue with the NASA engineer and with Nova.
(at around 34 mins) Fin and Nova stop at Charleston Air Force Base on their way to Orlando. However, Charleston AFB was re-designated as Joint Base Charleston in 2010.
When Fin and Nova are flying from Charleston to Orlando they fire a machine gun at some sharks. They are flying an F-4 Phantom which did not have guns relying on rockets for armaments.
Finn's spacesuit looks like its made from a hockey armor. Additionally, his trouser legs move freely and are clearly not airtight in any way.
When Fin goes into the back of the Shuttle to close the hatch and the sharks are entering, he does not have his helmet shield down, his face is exposed. If the sharks have entered he would be dead in a second without any atmosphere.
April is wearing a space suit when she is eaten by the shark , wearing a tank top and underwear when she cuts her way out , but yet she was somehow able to give birth to her baby while still wearing her underwear .
(at around 22 mins) When Fin is caught in the fog, he calls it a "Fognado." Keeping the same format, it should have been "Sharkfog."
(at around 30 mins) When Fin and Nova are at the back of the beast RV she loads a shotgun that has a knife/sword on it. When she moves the weapon at times the knife/sword wiggles likes made out of rubber.
(at around 46 mins) Rip Ride Rockit stops at the top of the lift hill. However, when Rip Ride Rockit is shown again, it shows the coaster on a set of brakes, not on the top of the lift hill.
(at around 35 mins) At the military base outside of Charleston they are in a mountainous area; clearly a location other than the Low Country region that Charleston is located in. Charleston is less than 50 ft above sea level. The mountainous area is over 4 hours away at the state border with Tennessee and Georgia.
April was somehow able to give birth to her baby while not only being fully dressed in a space suit but being swallowed by a shark as well .