When Nadja's school teacher announces Leonard you can briefly see his arm on the right side of the screen. However in the next shot he is seen coming into the room from the door far away from the teacher.
The short memory flashback of Geronda's telling about Shushurun is completely different than the lines of the actual Geronda earlier in the movie.
When the main characters drive to the airport the car is on the left side on the ride, while in Russia it has to be on the right side. When the camera angle changes from bird-view to normal view the car is on the correct right side.
When in Ivan's second dream he arrives at the empty market the person the nearest to him is dressed in black, the one behind that man is dressed in white and the last one is dressed in brown. However in the next shot the man in black is next to the man in white while the man in brown is behind him. Also the market tents look different in that shot.
The "School on the Taganka", where Nadya is going to, in the movie doesn't look anything like the real School Nr. 2104 on the Taganga in Moscow.
When arriving in Serbia the three main characters are off to the Copper Mountain. However the Copper Mountain, famous in the Slavic mythology, especially for the legend of the Misstress of the Copper Mountain, is in the Russian town of Polevskoy, in in the Ural mountain which is too far away from Serbia.
When Tsarytsin's army file is shown the first line supposed to be filled out as "Last name, first name, father-name", as it is typical in Russia. However this line is simply filled out as "Ivan Tsarytsin", with first name and last name in wrong order and without the father-name.
The Scottish island on which the school is on is named "Loch Horoch". However "Loch" is actually the start of a name for a lake in Scotland, not for island, which often have the name "Eilean" at the beginning.
One one of the files in the beginning of the movie the father-name "Gennad'evich" is written with one N: "Genad'evich".
One of Nadya's classmates in the magical school looks exactly like one of her classmates in the Russian school without explanation.
When the boss and the FSB officer are drinking tea sometimes the tea in the glass cups isn't moving when they drink it.
The animation of the scene when the teacher introduces Leonard and the one from the scene where she is impressed by his magic are exactly the same. Therefore the voice doesn't match for that either.
In Ivan's dream, where he is awaiting an award at the Russian Duma a completely different character who is awarding him looks exactly the same as him, only with brown hair instead of blonde.
When the FSB-officer is pouring in his tea from the samovar the amount of tea in his glass cup doesn't change.
When the students of military school cheer loud their mouth barely move enough to create such a cheer.
When the adult Zarizin, the army reviser, from the beginning of the movie, is talking to his friend the dubbing doesn't fit with his lips.
At the beginning of the third part of the movie when the army student is asking about Ivan and Petya his lips stopped moving on half of the sentence while his voice was heard.
When the FSB officer is showing the magic disease on the hologram globe one of the marks can be seen in the middle of the Caspic sea, where usually is no land or island or something similar where a magician or any other human being could be.
The school suppose to be set in Scotland and many writings and signs are therefore in English or with correct Latin letters. However on the blackboard during Kosh's lecture the word "Ariel" is written in Russian, even with. Also the entry sign of Kosh's office is written in Russian.
When arriving in Moscow Leonard's limousine is driving on the left side, while in Russia cars drive on the right side.
During the entire movie it is said that God is the only one who can make wonders. However later the Greek priests were able to read Ivan's minds. This wouldn't fit in the story.
Nadja mentioned that her parents are in Australia. Since the NATO is portrayed as the evil enemy in the movie, why are the parents of a protagonist, whom she loves, as she mentioned it in the movie, going to an "enemy"?
When the boys are building their mini-copters one of them is screwing the same nut over and over and the other is only hitting the propeller with a hammer, which doesn't make sense in that matter.
When Leonard uses his magic to create a red dress and it melts Nadya mentions it and mentions a flower bouquet that is also destroyed. However there wasn't a flower bouquet in the scene.
When arriving in Greece the priest greets them with the word "Kalimera", which is "Good morning" in Greek. The main heroes arrived there during the evening, so he should have said "Kalispera".
When the army sergeant starts telling the main story he starts by saying that it happened 15 years ago. However the live action scenes take place in 2018 while the main animated story takes place in 2004, which would be 14 years ago.
When the red dress, that Leonard conjured, melted Nadya mentions it and says that the "flower bouquet is also destroyed". However there wasn't a flower bouquet in that scene at all.