Fundamentals of Naked Portraiture - S1-E14
Audio problem: When Brian and Rebecca arrive at GERD (Global Enterprise for Research and Development) and Rebecca says, "It's people like this who decided mutually assured destruction as the best way to deter nuclear attacks", her lips don't match her words when she starts speaking.
This Is Your Brian on Drugs - S1-E11
Factual error: After Agent Rooks has taken NZT he does Sudoku puzzles. When Brian is flipping through the puzzles, the first 2 pages seem OK, but after that, the rest of the puzzles are filled in wrong, not a mistake someone on NZT would do.
Brian Finch: I can be really annoying when I'm on NZT.
Agent Ike: We've noticed.