Revealing mistake: When Zack and Cody are tied up by the secret spy, when Cody is texting Bailey "Help Me" with his toes, you can see that the Mobile has a black screen, and is turned off. And he was just hitting random buttons with his toes.
Revealing mistake: In the final scene where Cody is in the finals for A Yo-Yo competition, Zack's towel gun (which he uses to get towels to people) malfunctions and sends towels flying. Look closely and you'll see that the number of towels in the gun is not decreasing. It's obvious that the flying towels are fake.
Bon Voyage - S3-E6
Revealing mistake: When Mr. Moseby gets scared by the dolphin, you can see the dolphin is CGI.
Chosen answer: One: Zack doesn't meet Maya until after the movie. Two: There are 2 possibilities. The first one, the steps might worn off after they got to the ship. and the second answer, London said she talks to animals since she ate them, it never worn off.
Zack definitely met Maya before the movie takes place, SPOILER in the final episode when they break up Zack says they've been together for 3 months, and not only does the movie take place during spring break which is less than 3 months from normal graduation, but also their graduation date gets moved up since the ship got sold.
The movie is set between the last two episodes; they had already met.