About an hour into the movie, when Jessie is telling Aiden that his floors are being refinished, Jessie's scarf is tied differently within the same scene. She is shown front then back and it can be seen the scarf is different.
At the dog shelter, Jessie is wearing a gray sweater but later she's wearing a brown sweater.
Aiden says his mother made him the pillow that has a white tag at 21 minutes in. Either he is obviously and intentionally lying (unnecessarily) or it was a silly overlook in the movie.