Revealing mistake: When Cody falls through the air vents, you can obviously see that it's a dummy. When "he" falls, his body is perfectly straight. If you really were falling, you'd be screaming and moving.
The Suite Life of Zack and Cody (2005)
1 mistake in Orchestra
Starring: Ashley Tisdale, Brenda Song, Cole Sprouse, Dylan Sprouse
Odd Couples - S2-E1
Cody: [Holds up chocolate pudding.] I found your pudding.
Zack: Oh, thanks. But I could've sworn it was vanilla when I lost it.
Trivia: Maddy starts to film her movie and Mr. Mosby tells her that he is ready. Look at what he does right before she starts filming. He chants "Mah, mah, mah" and does the same thing Ashley Tisdale does in "High School Musical" before performing.
Question: What Happened to Muriel? Around season two she disappeared.
Answer: Keep in mind, Muriel wasn't very popular. So the writers/directors must have thought it'd be a good idea to let go of the character. No one seems to be complaining.