Lisa opens her letter and is holding letter and envelope together while she reads it but when she goes in to wake Oliver and tell him the news she no longer has the envelope.
When Lisa gives Oliver his cup of coffee he sets it in front of him and we can see a little trail of the goo on the inner side of his cup. After we see the close up of her pouring Uncle Fedor's cup it's a 2 person shot of just Oliver and Uncle Fedor who is telling her that she makes coffee just like her mother. In this shot we can see Oliver's cup which is fuller with no trail. Also different from the 2 person shot and 3 person shot is the sugar bowl's handle. It is visible in one then not the other.
Another mistake in the kitchen while having coffee. When Oliver sets down Uncle Fedor's hat and coat it holds back the window curtain but when it's the 2 person close up of just Oliver and Uncle Fedor the curtain has been straightened out then back to held back.