Adam's coat reappear on the door, after he leaves with it.
After Adam leaves the cooking class and Will is talking to Jack the lids on the cooking pans keep disappearing.
During the dinner scene at the start, the white napkin at Karen's place mat vanishes between shots.
When Karen is talking at dinner, Will is holding two plates. In the next shot he is holding three.
In the cooking class, everybody's attire changes between scenes. It is meant to be the exact same cooking class, however.
In the cooking class, there's a recipe on the chalkboard behind Jack and Stewart. Zucchini is misspelled.