When Alicia and Penny talk in the laundry room, you can see Penny fold a hoodie decorated with clouds then place it to the side, then it flashed to Alicia and when it went back to Penny, you can see her fold the same hoodie again and place it to the side once again.
During the stereo set-up, Penny's wine glass refills itself after she takes a large gulp of it.
When Penny and Sheldon are eating Chinese food, Penny switches between holding chopsticks and a fork, and Sheldon switches between two sets of chopsticks broken in different ways.
When Alicia holds the clipboard over the milk crate, her left hand is on the top. It then cuts to a closer shot and her hand is on the side. Then in the next shot, she's suddenly writing on it.