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 revealing mistake in season 3 - chronological order
Starring: Ashley Tisdale, Brenda Song, Cole Sprouse, Dylan Sprouse
Visible crew/equipment: At the beginning, you can see studio lights reflected on Zack's guitar during the song "Schools Out". (00:00:55)
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.
More trivia for The Suite Life of Zack and Cody
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.