After Dean introduces Luce to Cliff and they share Cliff's story of how he met his wife, she says "... I'm sure Penny was a wonderful woman", but at no point before that did they mention his wife name.
When Luce is walking with Dean after getting coffee she starts to look at a flyer for a Christmas lights event. When she looks at the flyer, she does not have her coffee cup with her. However, after the shot of the flyer the camera pans back to her and her coffee cup magically reappears.
The dog park is decorated for Christmas with poinsettias everywhere. Poinsettias are highly toxic to dogs and should not be where they can be ingested easily.