Continuity mistake: Mike takes a box of waffles out of the freezer. He takes a waffle out and puts it in the toaster. The shot changes he is no longer holding the box.
Continuity mistake: After Mike gives Ed the present Ed puts the bag on the table lying down. When Mike leaves the bag is standing up.
Continuity mistake: Mandy puts three bags on the counter. The two white bags change position a couple of times throughout the scene.
Answer: It looks like it was just a set change. They switched what side of the set the offices are on.
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