When Minoo is adding Rebecka on Facebook she first sends a friend request. Later she looks at the page and we clearly see that she and Rebecka are friends on facebook. Later Minoo gets a notice that Rebecka has accepted the request and Minoo acts as if Rebecka finally accepted the request.
When Minoo is in the school library, talking to Max, there are letters on the wall behind them, which are supposed to read "Bokklubb" (Swedish for "Book club"). However, there is only one k, so it's misspelled as "Boklubb" (which in English would be equivalent to either "Book lub" or "Boo club").
When Anna-Karin and Ida talk in the hall at the Saint Lucy celebration the reflection of the camera operator can be seen in the windows.