Exhibit A (above): The official tour portrait for Prince William and Kate Middleton's trip to Canada and California. The photo info states that the picture was taken in the gardens of Clarence House on 3 June.
Exhibit B (below): This is a picture of the royal couple taken on their visit to Darwen in Lancashire, dated 11 April.
Now we're passing it over to you - how many more differences can you spy?
Let us know in the comments!