Continuity mistake: When the meteorite falls on Munson's bed the glasses and papers on the blankets keep changing positions between angles.
Continuity mistake: The first time we see Flash waiting to ride in the plane he has no sports bag next to him, but the next shot he does, and in the wide outside angles of his car the bag is nowhere to be seen.
Continuity mistake: When Zarkov watches Kala's corpse, the amount of black goo changes between one frame and the immediate next one. This happens BEFORE her body starts collapsing.
Continuity mistake: When Dale escapes and fights the guards, the editing is really awful: first she knocks a guard, who later on changes positions. Then she walks away, leaves her shoes on the floor, and hides against a wall, but after a brusque cut she appears somewhere else, the shoes are 15 meters away and the guard from before lies in front. (I guess that some of the fighting in between was deleted.)
Continuity mistake: Ming kicks a silver cup into the void. When it falls, the cup becomes green coloured.
Answer: Spider.