Goofs

When the car chase at the end starts it has the plate number BAO 657 on the front and the back. In the middle when they hit the girl on the bike, it has a front plate number of BLA 581, and then later on when Johnny 5 lifts the car it reverts back to the number BAO 657.

After Johnny first gets hit by the white car, there is a torn/dented metal piece on the right side of his tread. When he's getting up from the ground it is gone and when Fred sees him in the alley, it is back.

In Short Circuit (1986), Ben's last name is Jabituya. In this movie, it's Jahveri.

When Number 5 is holding Oscar from the tree and one of the thugs smashes him with the crowbar from behind, we see the robot's head flop forward as he drops from the tree like it had been cut off. When we see him next, the head is still attached.

When Ben is talking to Sandy via the electronic board, a man blocks the board's view with his Popcorn/Balloon cart. Johnny 5 sends a message to him telling him to "MOVE IT". However, just as the cart blocks the board, the message "Tu Mama Hace El Amor Con Mi Perro" is shown. Johnny 5 then sends the 3 following messages to the popcorn man - "Hey You With The Popcorn", "Yeah, You With The Big Bunch Of Balloons" and "Move It". When the popcorn cart is moved, the message that was on the board when it was first blocked reappears.

When Johnny 5 attempts to catch up to the Chrysler LeBaron, he and Fred disappear into and emerge from a manhole. Johnny's wheelbase is noticeably larger than the manhole opening and therefore would not have been able to fit.

A Dodge Aries K (part of the Chrysler K platform) is a front-wheel drive car, and hence cannot spin its back wheels.

In the scene where Johnny 5 is attacked, it is obviously summer as the leaves on the trees are in full bloom. In the scenes following Johnny's repair at the Radio Shack it appears to be late fall with no leaves on the trees even though a period of only a few hours has elapsed in the film.

Despite playing an Indian character, Fisher Stevens is actually a white American.

When Johnny 5 is writing "GET BEN, U FIX" onto the wall, one can see, that these lines have been written there before. The lines have been erased, but can still be read when you look closely.

When Number 5 is in the warehouse building the little Number 5 replicas, you can clearly see the mechanism through the holes in the table making the little robots move during the scene where they are all moving together.

In order for the film to appeal to families, some dialog editing was performed to remove some swear words. For example, when Fred says "back to the wall," his mouth clearly says "balls." Also, when Fred says "He just ran out, he went ape on me," his mouth is saying, "He went ape shit on me." The film still contains similar words, but they are spoken in a humorous context or by the villains, not the protagonists.

After the factory gets vandalized, Ben and Fred come back inside. Fred says "Benny, you leave me with my back to the wall here...". The audio says "back", but his mouth says "balls".

Several thin black antennas can be seen protruding horizontally from Johnny's back in many shots. These antennas are used to receive signals from the puppeteers.

During the opening credits, when the toy Johnny Five jumps from the store counter onto a home trampoline, a launching device can be seen pushing the toy off the counter.

A cable is visible while the 'No. 5' toy jumps from the department store counter during the opening sequence.

When Johnny 5 is first assembling the toy you can see the wires attached to Johnny's hands that were used to ensure he grips the pieces properly.

When Number 5 shoves Jones (David Hemblen) across the ground into the pile of shredded paper, you can see the little tether strip of the rig on the back of his vest that Jones is being pulled on. The harness also briefly becomes visible when Jones flips into the pile before it tumbles down on him.

This movie is set in an American city, but when Ben is selling his toys at the beginning you can see a sign for an entrance to the Toronto Subway or TTC.

The movie is supposed to be set in a metropolitan American city, but the plates on the cars shown in the film are Ontario plates.

The movie is set in a major American city, but as the end of the film, when the chase has led Johnny 5 to the harbor, you can see Toronto's CN Tower in some shots. Even more, one of scenes takes place at the World's Biggest Bookstore, another Toronto landmark.

The movie is set in an American major city yet the truck that picks up the toy robots order is a Simpson department store truck. Simpsons only served Canadian cities.

A major sub-plot involves Ben studying to become a US citizen, despite the fact he previously worked at a top-secret US weapons laboratory, an extremely unlikely job for a non-citizen. Also in the first movie he tells Newton he is originally from Bakersfield (California) and that his family is originally from Pittsburgh (Pennsylvania).

At the end of Short Circuit, Johnny 5 builds a replica of himself (which was destroyed trying to escape) , so it is implied that the only way Johnny 5 would be safe is if he faked his own death.

However, at the end of Short Circuit 2, he's hailed as a hero for stopping the bank heist, putting him in the public eye. This would undoubtedly catch the attention of Nova, which had assumed Johnny 5 destroyed.

Partway through reading the book "The Hound of the Baskervilles" by Sir Arthur Conan Doyle, Johnny 5 announces "I think the chauffeur did it." On finishing the book a few seconds later, Johnny 5 confirms "he did." In reality there is no chauffeur in "The Hound of the Baskervilles."

When Ben is talking Spanish to Sandy, he says "Tu mama hace el amor con mi perro" to which she translates that to "your mother sleeps with my dog." Although that would be the family-friendly figurative translation the literal translation is "your mother makes love to my dog."

In Short Circuit, Benjamin tells Newton Crosby that he is originally from Bakersfield (California) and that his family is originally from Pittsburgh (Pennsylvania). In Short Circuit 2, while talking to Johnny 5 after retrieving him from the police station, Benjamin says he is originally from India.