When Pop shows Luke the photo of himself as a young man with his 2 friends (around 24 minutes in), the character on the left is much closer to Pop in the photo than he was when we see the photo being taken. The character on the right also has his second finger extended over Pop's shoulder in the photo but not when it is being taken.
When a game of chess is shown for the second time (22:45 min), the board is set up sideways, just as in episode 1.