Just watch this okay, just watch these two clips very carefully and tell me what's wrong. I am sure they thought they could get away with it, but.....not on my watch, buster. Actually, not on my watch if I watch the series a second time which is when I caught this.
I don't blame the director, if the actors cannot learn their lines, there comes a time when instead of saying "retake" you say, "Oh, what the hell..."
And the second video clip...
(Clip from Big Bang Theory, Season 4, Episode 3)