As Joy stops to take one last look at Pochenko before briskly leaving the party, a couple waltzes in front of her. Though not seen in the shot, it may be concluded by Joy's fast turn and angle that she either caught arms with the waltzers or stumbled into them as she turns to leave.
When Joy is packing up to leave for eastern Europe, she's talking to her mom and she has two trolls in her hand, and you can see that the troll with the blue hair is still on the stand. In the next shot, she has the troll with the blue hair in her hand.
When Joy returns home, enters through the front door and closes it, she only latches the chain. However, when her mother shortly thereafter opens the front door she has to first unlock all of the deadbolts.