Continuity mistake: When the mayor makes a strike while bowling, he raises one arm in celebration. In the second shot of the mayor after this moment, he is seen lowering both arms instead of one when he sees the rain-soaked George. (01:14:10)
Factual error: When the townspeople try to undo the changes brought about by David and Jennifer's presence, they declare that only certain recordings will be permitted, including those of Jack Jones. The action takes place in 1958. Jack Jones did not sign his first record contract until 1959.
Continuity mistake: In the scene with the TV repair man there are two shots taken from vertically above in which the pillows on the sofa are arranged differently than in all other shots. (00:11:15)
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