Question: How does old Biff know how to operate the time machine?
Mister Ed
28th Feb 2005
Back to the Future Part II (1989)
Chosen answer: He doesn't, but it's hardly difficult to work out - the date setting readout is pretty obvious. Biff presumably set the date, then just accelerated the car until the time circuits kicked in.
Answer: It's a plot hole. Biff couldn't have known or suspected the DeLorean's time-travel procedure, which necessarily included Biff setting the precise 1955 destination with no previous instruction. Biff just suddenly "knew" how to operate a time machine. He also changed the timeline by going back to 1955, so there's no way he could have returned to the "normal" 2015. But he does.
It's not totally impossible that Biff knew how to the time dial worked. He wasn't suspecting what it was, he knew it was a time travel machine and thus knew what the dial was for and possibly being technically educated knew how to use the time dial.
We know from the first movie that Biff, by age 48, was waxing cars for a living in 1985. He hardly had a "technical education" and it's doubtful he acquired a technical education by age 78 in the year 2015. It was established in the first movie that he had become a timid underachiever.
Alright I agree, he's not the sharpest tool in the shed. But he has lived for 78 years by then, till 2015. Even though he has no clue on how the flux capacitor works, he doesn't need to, all he needs to do is work the time circuits, a simple keypad system which even shows which display shows which time. For someone from 2015, it's not so hard to figure out.
Answer: He could have taken however long he wanted to figure it out, as long as he returned it to the exact time he took it from. We don't actually see him time travel with it when he takes it, so, for all we know, he could have taken it to his house and taken the few hours/days he needed to figure out how to use it.
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Answer: Old-Biff first comments on the flying DeLorean "I have not seen one of those in 30 years", then he sees what he believes to be two McFly Jr.'s and gets even more suspicious, next he spies on Doc and Marty having an argument about the almanach and how Doc is opposed to time travelling for personal gain! What else does he need to know? And lastly: We're talking about a time machine here! Old-Biff could have stolen it, kept it for how ever long it took him to figure out how it works and returned it at leisure. We don't even have any proof for the days he picked to departed from 2015 or to arrive in 1955. The only verified date is his return from Nov 12 1955 06:38 pm.