I am amused at how wrong SF authors often get the details of every,day future things. In Stranger in a Strange Land, set around 2000(?), one of the characters

I am amused at how wrong SF authors often get the details of every,day future things. In Stranger in a Strange Land, set around 2000(?), one of the characters mentions a mobile phone the size of a brief case. Or in recent David Weber novel, the heroes get through customs, because the agents hadnt received their photos. In the year 4000 something. I will admit that with a 2000 year advance in security the book would have been a lot shorter.