The original book on which this is based was not what you would call science-fiction, but more like history-fiction. Even though Philip K. Dick is known for science-fiction works, this novel was not science-fiction, but history-fiction. PKD's novel was inspired by a previous novel by Ward Moore called "Bring The Jubilee", which was history-fiction about what would happen if the South won the American Civil War, rather than the North. TMITHC the novel had a novel within a novel called the The Grasshopper Lies Heavy, which was the inspiration for rebellion against the victorious Axis powers, but it wasn't the supernatural newsreels from another universe as it is in this TV series.
When PKD wrote this book, in 1962, he set it in 1962, so to him it was set in modern times. The TV series is also set in 1962, but to us, it's a period piece, since it's well over 50 years later! We now have a lot of history that has happened since the novel. So the producers seem to have added some anachronistic touches to it to help distinguish between alternate realities. For example, in the Axis-winning timeline, certain technology is years ahead of schedule, such as Concorde-like supersonic airliners (which they call Rockets), monorails, what appears to be a Comanche-like attack helicopter, many decades ahead of schedule. Yet the automotive technology seems to have stagnated, cars and buses appear firmly rooted in 1940's and 50's design right into the 60's. It is meant to show that the Nazis had very different technological priorities.
The TMITHC TV show is a bit more rooted within science-fiction, with a little bit of history-fiction thrown in. These days concepts like time travel and the multiverse are very popular, so they've taken the TV show in that direction. I don't think it's badly done, just not really the same concept as the novel.
When PKD wrote this book, in 1962, he set it in 1962, so to him it was set in modern times. The TV series is also set in 1962, but to us, it's a period piece, since it's well over 50 years later! We now have a lot of history that has happened since the novel. So the producers seem to have added some anachronistic touches to it to help distinguish between alternate realities. For example, in the Axis-winning timeline, certain technology is years ahead of schedule, such as Concorde-like supersonic airliners (which they call Rockets), monorails, what appears to be a Comanche-like attack helicopter, many decades ahead of schedule. Yet the automotive technology seems to have stagnated, cars and buses appear firmly rooted in 1940's and 50's design right into the 60's. It is meant to show that the Nazis had very different technological priorities.
The TMITHC TV show is a bit more rooted within science-fiction, with a little bit of history-fiction thrown in. These days concepts like time travel and the multiverse are very popular, so they've taken the TV show in that direction. I don't think it's badly done, just not really the same concept as the novel.