[Quoth]

Imagine a place that exists today with no food or drink from the Americas and nothing from further east than the west coast of India, little to nothing unavailable 2,500 years ago to people in the West of Europe, Mediterranean / North Africa/Levant/Horn of Africa. That took a bit of research. Strawberries were tiny, like alpine types. Lettuce was more like dandelion in appearance, a little bitter and a lot more flavour, a similar variety still exists. Indian long pepper (ancient Romans imported it), horseradish and pepper corns are the hottest things. So called tea is actually Camomile, the ancients thought something so nasty but not poisonous must have healing properties. They were wrong! No actual tea or coffee. Pasta sheets but no noodles or tomatoes. No oranges and lemons, but the citron fruit.

I considered writing a book set in Ireland at the time of Queen Elizabeth I or even 12th C Normans. There are so many historical things to get wrong. Though forks, tea and coffee were known in the 16th C, they were almost unknown in England and Ireland till James. Which foods from Americas in QEI's time is a minefield. They did though have glass windows that opened normally and gunpowder. Oddly the up/down sash windows were a much later idea.

Georgette Heyer had over 1000 books just on the Georgian/Regency eras and bought letters of the time. Anything earlier than when you were about 10, or really a teen needs massive research. As Moonfleet is set about 130 years before being written, I'd wonder how accurate much was.
However the Elizabethan & Jacobean period was a first period of huge change, fuelled by gold the Spanish looted from South America, the second big period of change was the late 18th C, apart from technology and industry in the cities many rural aspects didn't change much till late 1940s. The 1850s to 1940s was the biggest technological changes in history. Very much technology and science from 1800 (battery) to 1916 (proposals for Electronic TV, Quantum Mechanics, Voice radio, remote controls, Relativity). The science and theories for almost everything in Electronics, Computers, TV, ICs etc existed by 1946. It was poor material purity that held up making working transistors.

Victorians invented or had: Submarines, Steam turbines for ships and electricity, wired telegraph, radio, mechanical TV, fax, telephone, record players, magnetic "tape" recorders, typewriters, punched cards for data sorting, gas mantel AFTER electric lights, the pen that uses a fine tube, a big ballpoint pen for packing cases, Movies, colour still photos, but not a reliable fountain pen with a nib. Electric torches. Diesel, petrol, steam and electric cars. Most Sherlock Holmes films/TV set in Victorian times show London of a pre Holmes era. Maxwell, a Victorian, really proved the speed of Light and it was a constant. The Victorians invented a kind of CRT (in UK and Germany). A computer was a person. The first real computer was by Konrad Zuse, working by 1938. Fortunately the German Military wasn't much interested.

The Napoleonic era had optical telegraph and codes introduced due to financial fraud (what we'd call wire fraud/hacking).
The first "spam" messages where in Victorian London when telegraphs could be installed outside of post offices.