Revealing mistake: When Kellaway shows up at Stanley's apartment to question him about his pajamas and Stanley scrambles to stuff all the stolen bank money into his closet, you can see that a few of the bills are blank on the back side, revealing that the money is a fake movie prop.
The Mask (1994)
Ending / spoiler
Directed by: Chuck Russell
Starring: Cameron Diaz, Jim Carrey, Peter Riegert, Amy Yasbeck, Peter Greene
Stanley Ipkiss(Jim Carrey)gets the mask back from Dorian and his gang.Stanley and Tina kiss,and Stanley throws the mask into the water to get rid of it.
Sondra
More mistakes in The MaskMore quotes from The Mask
Trivia: The set of the garage where Ipkiss has his car repaired is the same building as the Ghostbusters' headquarters (from the "Director Commentaries" in the DVD).
Question: Why would he have to steal the money from the bank? Given everything else he makes.
Answer: While under the influence of the mask, Stanley repeatedly gets revenge on people that have wronged him. The Mask wouldn't even need to create money out of thin air to get into the club since he could just use his powers to get in, so since he feels that he is mistreated at the bank, he robs it.
Answer: Nothing he makes while The Mask is permanent, and when separated from him reverts or disappears, as we see with the piece of pajama. If he made money, for example to get into the club, then immediately after giving it to the people and walking inside, it would vanish, probably causing him then to be thrown out. As Phaneron said, in addition, by robbing the bank to get it, he also strikes back at one of those he feels mistreats him.