When Sean runs after Emily at the dance at the beach, there is a woman in pink dancing behind him. in the next shot, the same woman is walking in front of him.
When going to the party, there is a sign that says "no employees allowed". He removes the sign with a snatch and holds it in his hand. Next shot it's gone and is neither in his hand nor on the floor.
"To Build a Home" by The Cinematic Orchestra. The complete list of songs heard in the movie can be found here with their corresponding scene and time descriptions.