Continuity mistake: When the father is playing with the yellow thing in the office, the mom comes in and he puts the toy on his lap. Immediately after, he still has the toy in his hand and then puts it down, again.
Factual error: Juni is sending the bad twins to Gobi desert. After few scenes, we can see the bad twins in the middle of Gobi desert. They get there with a submarine. How can they enter to a middle of the desert with a submarine inside the water?
Continuity mistake: As Gary and Gerti make it to the beach, Gary says he is going to "zap" the monster in the ocean. When they show him trying to zap the monster, his watch strap is undone, but when it cuts the strap is now secure.
Plot hole: When Carmen is undercover as a pop star at the end of the movie,the crowd was cheering her name(Carmen). If she's one of the top spies, she would know not to use her real name if she was undercover.
Other mistake: When Gary and Gerti fall in the camel poop, there a few things wrong with that: 1) camels poop in "pellets", not like what you see in the movie; and 2) Gary and Gerti are both in the centre of the pile when they should be at the end of it. They are both in the same spot (it has nothing to do with leg length).
Answer: Her sock colour is most likely black during that scene as it was when they were in the treehouse.