A High-Pitched Buzz and Training Wheels - S2-E1
Continuity mistake: When George gets out of bed to go and comfort Mary at the window, he puts his hand on her shoulder. When the camera changes to a view from the front, the hand on her shoulder has gone. (00:09:50)
Answer: Mary is highly religious and completely against any form of alcohol as shown in Big Bang Theory numerous times.
Ssiscool ★