After Papi tells the pups the story about the fearless Chihuahua warriors, Papi Jr jumps up on the flowerpot on the window, pretending that he was a warrior fighting a poisonous snake (which in actuality was a vine). The screws come loose, however, and both the flower pot and the puppy go crashing to the ground from the second floor. Delgado, the German Shepard police dog that Chloe met in the first movie, catches Papi Jr and puts the pup safely on the ground, but the pot can be heard smashing against the ground. However, in the wide shot afterwards, there is no sign of broke ceramic, and when it shows the other puppies looking out the window, the pot is back in place, with no sign of it ever breaking free.
The goof item below may give away important plot points.
Crew or equipment visible
During the wedding reception when Chloe and Papi are dancing they are clearly on a turntable, right before Chloe says, "And I'm the luckiest girl alive." there is a brief moment where the light hits it just right and you sees a wire, holding the dogs up, a few seconds later, you can see another wire.