This is not meant to be a treatise on short story writing. Far be it for me to advise anyone on the subject. I prefer to say how it is that I do it so you can learn all of the pitfalls in one go.
Now, there’s this thing called continuity, but it covers a whole range of writing sins, most of which I eventually get caught out. Films sometimes miss a few items, like back in the roman days, there are plane trails in the sky, in a 1920’s period piece, there’s a mobile phone sitting on a desk.
Like one minute the hero has a gun, and the next he’s fighting for his life with a knife, and, hey presto, there’s that gun again. The error might not be that big but you can’t pull out a weapon you don’t have or wasn’t there in the first place.
Similarly, the hero pulls out a mobile phone, but there’s only one problem, it’s 1980, and there are no mobile phones. Our problem might be that we are so used to doing and using certain things that we might forget, for a minute or two, that were not available in the past.
The same goes for the fashion of the day.
And my all-time favourite, getting the right make and model of car.
Oh, and just for good measure, back in the old days they used acoustic couplers to attach to phones via a serial port to dial-up not a server, but a BBS, Bulletin Board Service, at a rate of 300 baud, or a little while later, 1,200 baud.
There was no internet in general use. If you wanted to call the office when out, use a telephone box. Or carrier pigeon.
And the use of language, there’s a lot of stuff relevant today that was not used back then, and there was a lot of stuff back then that isn’t tolerated now. Some of it might be hard to get your head around. It isn’t for me, because I can remember the 1970s and 1980s, but I’m not too sure about allowing some of what happened then to creep into my work.
So, you get the picture. Try to use the past as the past, or leave it in the past.
Unless it’s a book about time travel, then all bets are off.