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Continuity: When Jack is in his new classroom for the first time, he sits at a metal desk. He falls with the desk when he tries to reach his book bag, which is sitting next to a broken wooden desk. Next, he sits in the same - miraculously whole - wooden desk, then proceeds to break it to smithereens.
Continuity: Jack is at home after he had the heart attack (or whatever it was). His mom comes in to his room to tell him he can't go to school anymore. Jack gets upset and rips the heart monitor thingies off his chest (notice his shirt is unbuttoned). The camera cuts to his mom for about a split second, then back to Jack. Now his shirt is buttoned. There is no way he would have had time to button it.