When the baby leaves the gorilla cage his shoes are untied. After crawling into the park when the trio find him, his shoes are tied.
When the baby first escapes and crosses to next building on the wooden board, Norby and Veeko also jump on the same building. Then the baby comes out of one building but Norby and Veeko come out of a different building.
When Eddie, Norby, and Veeko first notice Baby Bink on the bus and run toward their van to chase after him, Eddie's hair is all messed up and it and his face are still covered in bird seed, etc. from when he fell off the building. In the next scene, when they are driving after the bus, he's perfectly clean.
During the zoo visit, all three men sustain serious injury. In the next scene - the construction scene - they all seem fine. In the final scene with them, they are icing hands and other body parts and Eddie is walking as if in pain.
In the beginning of the movie, the baby's father is in the back seat of a car, accompanied by some police cars, and holding in his hand the letter from the guys that kidnapped his son. The whole text is clearly shown for a second, then the camera shifts between certain words written on the paper : "5 million dollars", "trash bag in the alley" and "by midnight". However, when the whole piece of paper and the whole text were on the screen, it was very clear that the words "by midnight" were nowhere on the paper. The whole text said only "Mr. Cotwell, we have your baby! Put $ 5 million dollars in a trash bag in the alley behind the Ovaltine factory. No police!"
Obvious stunt double when Eddie falls into the trash dumpster.
Fake body clearly visible when Norby falls face first on the 2 x 4 at the construction site.
Obvious stunt double for Eddie when he gets whacked in the face with the board and falls onto the roof.
When Eddie is whacked in the face by the board and falls backwards onto the roof, the brick chimney near him wobbles from the impact.
When Joe Pantoliano takes off his stockings mask in the beginning of the movie, you can see that he has a booger in his right nostril.
Eddie's safety wire is visible when he's falling from the side of the building.
A safety wire is visible when the gorilla catapult Norby in the air.