Netflix and Hulu streamingOne of the most boring elements of being in a car is when you're parked and sitting waiting around, perhaps to pick someone up from work or school. While the default choice for most car owners is to resort to their phones, Tesla offers a host of in-car entertainment features to pass the time. One of those is Theater mode, which allows drivers to stream content from leading platforms like Netflix, Hulu, and YouTube directly to the central touchscreen.Theater mode recently benefited from a UI overhaul for easier operation, and it now includes a wider range of streaming providers, from Twitch to HBO. So no matter what your platform of choice is, you should be covered. For safety reasons, the feature is only available while parked, and you'll need either a WiFi connection or a cell signal and premium connectivity to make use of this feature. If your Tesla doesn't have premium connectivity equipped, you can still stream video via your phone's connection by turning your device into a WiFi hotspot and connecting your car to that hotspot.Panoramic glass roofStep inside a Model 3 or Model Y and one of the most immediately noticeable features you'll find is the glass roof that gives the car a more open, airy feel than most of its competition. The glass used was designed specifically by Tesla, using several layers of different materials to provide acoustic insulation and UV reflection, among other things. Tesla says the glass can withstand up to four times the car's mass, making it just as safe, if not safer, than many metal-roofed cars.Glass roofing is also available on the Model X and Model S, with CEO Elon Musk boasting at the time of the Model X's launch that its panoramic windshield was the largest single piece of glass ever used in a car. As you might expect, such a technically complex component is also quite expensive to replace, with one owner quoted $2,290 for a replacement panel after getting a crack from a rock hitting the windshield. A potentially wallet-busting feature, but a cool one nonetheless.Dog ModeLeaving a dog in a hot car for even a short period of time can be a serious risk to its health, and is generally a big no-no for any responsible dog owner. That is, apart from Tesla owners, who can engage Dog Mode while they're not in their car to keep their pooch cool on sunny days. This feature keeps the air conditioning running while the doors are locked and you're away from the car, as well as displaying a notice to any concerned passersby explaining that your dog is comfortable and you'll be back soon.That latter part is still very important — while it's very useful to have, Dog Mode doesn't enable you to leave your dogs unattended for a long period of time. Still, if you just need to pop into the shop on the way back from taking your dog for a walk, Tesla has you covered.White vegan leather seatsTesla's cabin design is already quite futuristic, but anyone looking to really double down on their car's cutting-edge appearance can opt for striking white vegan leather seats. They come as part of the white interior premium package, which adds either $1,000 or $2,000 to the final price of the car depending on which model you buy.Many potential buyers of this package might have concerns about wear and staining, especially stains from darker-dyed clothing like denim. However, reports from owners and long-term reviewers have found the seats to be largely hard-wearing, with any stains easily removed with baby wipes or a damp cloth. Bleach and strong cleaning agents can damage the seats, however, so it's best to avoid using anything of that nature on them. The earliest Teslas used real leather for their white seats, but the automaker switched to vegan leather in 2015 in an effort to improve its sustainability.Bioweapon Defense ModeDespite its over-the-top sounding name, Bioweapon Defense Mode is actually a very practical feature designed to filter out the pollutants that are present in the air before they makes they way into the cabin. A HEPA filtration system filters out pollen, bacteria, and chemical pollution, leaving the air that's channeled inside the car a lot cleaner than whatever's outside. That's especially handy when what's outside happens to be something smelly, like a field covered with animal manure, or a landfill.It's also beneficial when you're stuck in traffic on the highway, as nearly all of the potentially harmful pollutants produced by gas-powered vehicles are removed before they reach you. Tesla has extensively tested this system and claims it's so powerful that you could use it to survive an actual bioweapon attack if necessary, but thankfully, it's unlikely that most Tesla owners will ever need to put this particular claim to the test.CaraokeIf you're waiting in the car and don't fancy making use of Tesla's Theater mode, there are still plenty of in-car entertainment options to keep you busy. One of those is Caraoke, which can be accessed through the media player. It turns the car into a mobile karaoke bar, with the central touchscreen displaying lyrics that you can sing along to while you're parked up. In some territories, Caraoke is also available when driving, although Tesla cautions that lyrics on the screen should only be read by passengers and not by the driver.You can either sing alongside the original vocal track or remove it entirely by touching the microphone icon. In China, Tesla took the feature a step further by offering a "TeslaMic," which makes use of a country-specific interface to feed your vocals back to the system. It proved very popular, with the demand crashing the carmaker's website almost as it launched. There are no plans to bring the TeslaMic to the U.S. or Europe.