Factual error: When Reese Witherspoon's character is sitting at the desk reading, there is a cheerleading trophy and the cheerleader on it is wearing a mini skirt, - they didn't have mini skirts on the cheerleading outfits then. (01:08:20)

Pleasantville (1998)
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Directed by: Gary Ross
Starring: Reese Witherspoon, Jeff Daniels, William H. Macy, Joan Allen, Tobey Maguire
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Jennifer: Hey, can I ask you a question?
David: Sure.
Jennifer: How come I'm still in black and white?
David: What?
Jennifer: I've had, like, ten times as much sex as the rest of these girls, and I still look like this. I mean, they spend, like, an hour in the back seat of some car and all of a sudden they're in Technicolor?
David: I don't know. Maybe it's not just the sex.
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Answer: We don't see much of the "real world" after David returns other than his conversation with his mother. I am sure in time she would have been worried but there seem to be many unanswered questions which might make it not so simple.
Lummie ★
Considering that a couple of days in Pleasantville turned out to be just an hour in the real world, it's possible Jennifer could spend 3-4 years in uni and cone back with it being just a weekend in the real world. David could just make up something in that period she's gone.
Actually if a couple of days is just an hour than 3-4 years is more than 2 weeks.
lionhead