Smartphones are very 21st century and futuristic. Even cellphones, really. My parents have compared them to tricorders out of Star Trek. Same goes with laptops--pre-1970, those would have just been the realm of science fiction.
Flying cars as any science fiction imagines them are pretty much ASB, since that would mean everyone would need to get a pilot's license to use them. The only way I could see it working is if it's basically a passenger drone, which looking at recent developments in both drones and self-driving cars, could totally work once you get the price down.
Mars colonies are too worthless to ever really consider. Too far, too disconnected (almost 10 minute lag in communications), and not economically viable even if we did have a cheap route to space. Why not just build them on the Moon instead? And with that logic, why not just build them around the Lagrange points, where you can actually have Earth (or close to it) gravity? Gravity issues are a huge problem for any Moon or Mars colony, since any human developing in those conditions would have extreme difficulties on Earth. They'd basically be like Robert Wadlow--very tall, but very fragile. I'd argue that second to solving the issue that launching things into space is ridiculously expensive, the gravity issue is number two issue for a Mars (or Moon) colony to solve. That said, I think it's very likely we could actually
go to Mars by 2016. But live there? No. Unless you have your POD back billions of years ago and have an Earth-sized (or near to it) planet form where Mars is.
No Black Plague, no Inquisition, and the U.S.S.R surviving would allow technology to develop at an even greater rate to the point where tech could probably be 300 years more advanced as a result. This could result in a world that looks similar to Mcfly's home Earth but with no Black Death and Inquisition anything could happen at this point.
No Black Death or Inquisition probably means no USSR or a totally different sort of USSR. And actually, the Inquisition didn't really have a lot of effects on technological development. Avoiding the Mongols is probably the best, second is getting better disease science, like early germ theory and vaccination.