When Annablle Vandersloop is leaving, she puts her hand accidentally on Emerson's chest. The palm of her hand lands flat on his plastic raincoat. In the next shot there's a close-up, and you can see that now the hand is positioned half on the raincoat, half on Emerson's lapel, leaving a white stain. In this close-up, the stain is positioned so that the fingers start above Emerson's pocket, and just the index finger and thumb on his lapel, but after Annabelle leaves, the stain is now positioned lower, with the tips of the fingers barely reaching the bottom of his pocket, and no stain on the lapel. When we see Emerson behind the desk, the stain is now showing not a half, but a fully impressed hand, with the whole thumb, index and middle finger on the lapel, and positioned higher, back again to above his pocket.
When Annabelle Vandersloop presses the red button on her diorama, the building explodes and part of the front wall falls off. A moment later, when she reaches inside the glass box with the diorama to replenish the glitter, the wall is back in place.