Branch's hug bracelet changes from left to right, then back to left.
The Funk Trolls put the needle on the inside of the vinyl record to start their story. That would be the end of the record side and not the beginning of a song. However, it could be that trolls design their records in this way.
The film does not define hip-hop properly. It is a musical genre in which emcees rhyme over beats. Singing only occurs in choruses if at all. The elements of hip-hop culture are rhyming/emceeing, DJing, graffiti/aerosol art, break dancing, and beat-boxing.
At one point, Queen Barb and her fellow Rock Trolls are seen rising out of the sea to attack other trolls. Not only are the aircraft shooting flames, but the trolls are both breathing and singing whilst underwater.
Poppy asks Branch to give her a high five, by saying: "Five it up?"
All the trolls in the movie only have four finger hands.