The painting on Leanne's wall a depiction of a passage from Numbers 22 in the Bible. In the passage, the prophet Balaam's donkey sees an angel blocking their path, but Balaam cannot see the angel, so he beats his donkey. The donkey then begins to miraculously speak to Balaam. This story is where the title of the episode comes from.
Sean points Leanne to a bottle of Petrus '96 in his cellar to pair with her Campbell's tomato soup. The value of that bottle is over 3600EUR.