Continuity mistake: At the start, the cards in Sheldon's hands keep changing between shots. (00:00:40)
Continuity mistake: When Sheldon and Missy are sitting at the table, Missy puts a paper in the basket in front of her. A couple of shots later when she says "sounds right" the paper has disappeared. In the next shot it reappears, in a different position than it was before. (00:06:20)
Continuity mistake: In this episode, the voice over version of Sheldon states that he never got his drivers licence. However, in series 12 of The Big Bang Theory, he tells Amy that he got his drivers licence 2 years ago. (00:11:40)
Answer: It's as simple as money is tight, it's not "George's money", it's the family's money so the expenditure was selfish.
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