At the Music Academy: when camera shows the sheet-music for the two violins, viola and cello and their conductor, it is all piano-music. The front brackets connecting left-hand and right-hand music lines are clearly visible. Impossible for string players to use this to play a string quartet. Anyway the soundtrack is the Boccherini QUINTET which needs 5 players not 4, there's a cellist missing (throughout the movie).
When at the Music Academy: the second violin and the viola are shown sharing a desk and sheet-music. This can't happen because violin music is written in the treble clef, viola music in the alto clef.
When the hero and heroine go to the Music Academy to find a replacement string quartet for the wedding, the soundtrack is the minuet of Boccherini's string QUINTET. Which needs FIVE players. When inside, there are only FOUR players, so impossible to perform the Boccherini. Same for the actual wedding : only 4 players in the picture, yet soundtrack played needs 5 musicians.
Around the half of the movie, Shane is sitting in the beach chair and is holding iPad mini. He stares at the display and comment what he sees on it. However, display is clearly shut off.
Right at the beginning of the movie, alarm clock rings and Jessie wakes up in her bed - with the perfect makeup! It's especially visible pinkish lipstick and orange upper eyelid. Few minutes later (hours in movie) her sister calls her, and she again wakes up the same perfect make up. In the next scene she run out out of her house and again you can see the same makeup on her.
In one of the "shutter releases" at the airport when Shane and Cole arrive, Jessie has a finger partially over the camera lens.