In the beginning of the show, Miley has a sweater on, and it's buttoned in the middle, but in another shot it's opened.
When Miley hugs Robbie Ray after his performance, the scene cuts from Miley hugging him to Miley standing right next to him between shots.
During the beach scene, obvious painted background because there is no movement of the ocean or people on the beach during the close ups of the characters. This happens in various episodes.
The three so-called Swedish girls aren't Swedish at all, their accent is all wrong and the Swedish words they say aren't correct. Neither is the line Robbie Ray says - the only word he get's right is "Tack", the rest of his words don't make any sense at all - even for an American trying to speak Swedish.