Goofs

When a man cuts the line in front of Sheldon, they get into an argument about whether "Avengers" writer Joss Whedon would be okay with such things.

The man says the Avengers are rule-breakers, to which Sheldon replies, "They work for SHIELD, which is a sanctioned department of the U.S. Government! Do you work for a sanctioned department of the U.S. Government?"

To which the man replies, "As a matter of fact, I do. At a little place called the DMV."

There is no federally-run DMV. All DMVs are either state-run or, in the case of Hawaii, locally-run.

Sheldon asks Trevor if he works for the U.S. Government. Trevor says he works for the DMV. The DMV is a state government organization, yet Sheldon doesn't notice or point out the difference.

Sheldon has an eidetic memory...if he had been given the names of the people on the flash cards even once before, he would remember them.

Despite Sheldon being well known for his eidetic memory and remembering very specific details, he had to think because he couldn't remember the celebrity Khloé Kardashian when Penny was quizzing him with flash cards. He then remembers because he had to use a memory trick, which given his character he shouldn't have to do.

When Stewart knocks (as a normal person would) on Penny's door, Bernadette suggests that it might be Sheldon, coming to apologize. Disregarding the unlikelihood of Sheldon apologizing, no character in this show would forget his characteristic knock.