Continuity mistake: While Cissy and Jessica discuss inside the tennis club, a man with a blue shirt walks behind Jessica. From the opposite angle, he's metres behind, entering the place again, though he now exits through the left.
Continuity mistake: At Elliot's office, Carol discusses with Cissy, whose arms swap between crossed or not depending on the shot.
Audio problem: When singing "Goodbye little yellow bird" Emma blows a kiss to Oliver offstage, but she is still singing the song when she is blowing the kiss. Although it's possible she was pretending as it was part of the act, her voice wasn't even muffled by her hand.
Trivia: Angela Lansbury is the only actress to appear in all 264 episodes of the show.
Question: Why did Lane Henderson (Louise's father) murder his wife?
Answer: In a flashback scene, it was shown that he had a violent temper, so it stands to reason that he finally killed her in a fit of rage.