When showing Bernadette all the different ways to make toast, Sheldon neglects to mentions the Cylon toast (from Battlestar Galactica (2004)) which he made in The Cornhusker Vortex (2009).
In this episode, Sheldon states that has avoided raw fish for years. However, in a previous episode (S4 E10: The Alien Parasite Hypothesis) Sheldon is eating sashimi while eating lunch with Amy in her lab.
Which was, of course, 5 years ago. So, Sheldon could easily have avoided eating raw fish since then.
Which was, of course, 5 years ago. So, Sheldon could easily have avoided eating raw fish since then.
When Bernadette talks to Sheldon she says "I'm sorry, but I have to ask." but the actor says this line with her original voice. The character has a distinctive voice the actress keeps through the series but she slips here.