Visible crew/equipment: To escape Two-Face's ambush, Batman tilts the batmobile onto its rear wheels, and thanks to the bat-hook, he's able to use the vertical facade of a building as an alternate route. As the batmobile rides up the building, if you look closely you can see what looks to be a wire behind the batmobile (probably helping the batmobile or a model of it travel smoothly up the building or a model of the building). (00:50:35)

Batman Forever (1995)
1 visible crew/equipment mistake
Directed by: Joel Schumacher
Starring: Nicole Kidman, Tommy Lee Jones, Drew Barrymore, Val Kilmer, Jim Carrey, Chris O'Donnell, Michael Gough
Revealing mistake: When Two Face and Riddler enter Wayne Manor, and knock Alfred down. Alfred, unconscious, pushes the dinner tray aside, so the thugs can carry him into the closet. (01:27:55)
The Riddler: Riddle me this. Riddle me that. Who's afraid of the big black bat?
Question: If Bruce had backed Edward's invention, would Edward have still done what he did in the movie (using the device to grow smarter, try to outdo Bruce etc)? Or did Bruce spurning him cause him to do that?
Answer: And more precisely, narcissists like Edward Nygma/The Riddler can barely tolerate when someone else refuses to have their ideas, viewpoints, or feelings prioritised or contrasted against others, even if it is for a legitimate cause or logical reasoning. The fact that Nygma already had a sense of envy towards Bruce's fame that he idealised would all but guarantee that he would seek some kind of revenge or humiliation on Bruce, no matter what the circumstances would be if Bruce had in fact done so later.
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Answer: It's hard to say for certain. If Bruce had approved of the project, there would have been a lot more volunteers and oversight of its production, which would have alerted Bruce of the device's side effects, at which point he or one of his underlings would order its production to cease. Edward would still feel spurned and motivated to continue his work, but without the resources of Wayne Industries at his disposal, he may have a more difficult time seeing his plan through.
Phaneron ★