When Mandy hands Georgie the pregnancy test, the red cap is pointing to her left. When he takes it from her, the cap is pointing to her right.
Sheldon is upset because Isaac Asimov had just died, which was on April 6, 1992. Later, Missy tells Pastor Jeff that a good movie to see is Beethoven (1992), which debuted on April 3, 1992. At the beginning of the show, Georgie says he "turns eighteen in March", which is something you wouldn't say if it's April.