Other mistake: Duke is running through the city while dragging Max by his leash. A close-up shows Max being pulled between the bars of a metal fence, but the gap is much too small for Duke to have passed through.
The Secret Life of Pets (2016)
1 other mistake - chronological order
Directed by: Chris Renaud, Yarrow Cheney
Starring: Kevin Hart, Lake Bell, Jenny Slate, Ellie Kemper, Louis C.K., Eric Stonestreet
Audio problem: The Rabbit leads the two main dogs past the snakes with the password. The first few words he says, his mouth isn't moving.
Pops: That ball of fluff's got a screw loose.
More trivia for The Secret Life of Pets