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.
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 and Fred are sending Sandy the tones for a rescue, we see and hear Ben play the "Help me Rhonda" song 3 times. When Sandy plays the tape back, we only hear that song twice and at a much faster pace.
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.
While reading the book "The Hound of the Baskervilles" by Sir Arthur Conan Doyle, Johnny 5 announces "I think the chauffeur did it" and then on finishing the book a few seconds later confirms that "he did". Even though it has been pointed out there is actually no chauffeur in the novel, it is likely this generic 'whodunnit' scenario was given by the writers to Johnny 5 in order not to spoil the book for those who may not yet have read it or seen any of the film adaptations.
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.
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.
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.
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.
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.
When Oscar (Jack Weston) tries to take a swing at Fred (Michael McKean) during the climactic fight scene, his jacket lifts up to reveal his radio microphone pack.
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.
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 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.
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.
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.