F. Paul Wilson's first Repairman Jack novel, "The Tomb, was published in 1984. He then updated some references in the 2004 edition and, (I think) slightly revised some of the text to better fit into a more mature vision for that character.
I'm including two brief excerpts each from both versions. See if you can spot the differences that 20 years can make:
1984 edition
Repairman Jack awoke with light in his eyes, white noise in his ears, and an ache in his back.
He had fallen asleep on the couch in the spare bedroom where he kept his Betamax and projection tv. He turned his head toward the set. A nervous tweed pattern buzzed around on the six-foot screen while the air conditioner in the right half of the double window beside it worked full blast to keep the room at seventy.
...
Jack allowed Kusum to lead him out the front door. As he left, he waved to Julio, who was setting up his infamous “FREE LUNCH: $2.50” sign.
2004 edition
Repairman Jack awoke with light in his eyes, white noise in his ears, and an ache in his back.
He had fallen asleep on the couch in the spare bedroom where he kept his Betamax and projection tv. He turned his head toward the set. A nervous tweed pattern buzzed around on the six-foot screen while the air conditioner in the right half of the double window beside it worked full blast to keep the room at seventy.
...
Jack allowed Kusum to lead him out the front door. As he left, he waved to Julio, who was setting up his infamous sign, Free Lunch: $5.00. Right under the Free Beer … Tomorrow sign.
The earlier edition was marketed as a horror novel (as was the author). The cover showcases these promotionl elements. The later edition seems to be marketed as more of a thriller. (I'm not too thrilled with that cover, by the way, which appears to my eyes to be rather bland.) The fact is that the bottom had fallen out of the horror market years earlier and was now seen - and is still perhaps seen even now - as a ghetto market, as something to be avoided unless you wanted your writing career to go nowhere. This may be an arguable consideration in today's market, as well.
If you have an old piece of writing from years earlier, you may wish to go back and update references to that 1984 Apple Macintosh computer (think 'Seinfeld'), unless it is important as a period piece or sheds light on the character.
Don