In an earlier episode, Bernadette mentions that Howard has one chest hair, but you can clearly see here that he has a full chest of hair.
At the Cheesecake Factory, Priya's water glass fills itself without Penny pouring her any. The water level then changes even though Priya never even took a sip.
Sheldon tells Penny that it is Thai food, not Chinese as she thinks she has smelled, and proceeds to eat it with chopsticks. In The Big Bran Hypothesis (2007) he explained that you don't eat Thai food with chopsticks but use a fork to put the food on a spoon which then goes in the mouth.
When Howard and Bernadette are in bed on their first night living together, the amount of hair on Howard's forehead changes between shots.
In the Chuck Lorre vanity card at the end, "Nielsen" (referring to the ratings company) is misspelled as "Nielson".