When Connect 3 performs "Heart and Soul", you hear the piano play throughout the entire song, yet there is no piano player on stage.
In the song "This Is What We Came Here For" at Camp Wars, Mitchie and Shane ascend the steps while singing, but neither have their microphone up to their mouth.
Before and after the kiss between Mitchie and Shane, it can clearly be seen the change of positions. During the kiss, Mitchie's nose is behind. After, Shane's is.
During the song 'Can't back down', Mitchie's fringe changes from being clipped to hanging down.
During "This is Our Song", Sander is playing his drumsticks up against the bench, then there's a cutaway of him playing the tambourine, then he's playing his drumsticks again with no tambourine to be seen.
In the final "This is our Song" scene, it appears to be raining in the background of the campfire, but no one is getting wet by the campfire.
During "What We Came Here For", Mitchie's breath creates fog. This is due to the weather being cold, and shows that this scene was not filmed during the Summer.
When Mitchie watches Trevor's videos on his camera, it shows Trevor filmed the water balloon fight. But before this in the actual scene, he was shown throwing water balloons and not filming.