When Andy and Ron are headed towards each other in the hallway after Ron makes things awkward, Andy rapidly turns and runs into a woman wearing an orange coat. That same woman then appears behind him in the next frame.
When cutting back and forth from Ron's shoe shine his pants alternate between rolled up and rolled down.
At the end of the episode, when they are hanging the office picture, a film light is visible in the top left and part of production area is visible on the left.