While it is super important to make sure you get the correct supplies for your new rabbit, it is equally important to know which items to avoid purchasing. Some are simply not particularly useful, but some can cause direct harm to your rabbit.
Plastic hutches. Avoid this style of hutch, as they have solid plastic flooring. The plastic flooring offers no traction, which causes the rabbit to slip and slide around and scare themselves, often causing injury. Because the flooring is solid, it also allows the rabbit to sit in its own pee and poop which is what causes hutch burn and sore hocks. Additionally, the wire is low quality and lacks durability. This style of hutch is not recommended for any rabbit.
Wooden hutches. While they are certainly pretty, they are not an ideal form of housing for a rabbit. Wood is close to impossible to keep sanitary, so when it is combined with rabbit pee, it provides an ideal breeding ground for bacteria and mold. There is very poor ventilation, so the rabbit is constantly breathing poor quality air. Because these hutches are either completely or partially solid flooring, the rabbit sits in its own pee and poop which is what causes hutch burn and sore hocks. Because there are so many opening doors, it is easy to startle your rabbit and cause them to become difficult to handle. The fact that there are two stories makes this even harder, and also lays the rabbit open to injuries from jumping back and forth between levels. Rabbits are also renowned chewers, and most will ruin this type of hutch in no time at all. To me, these reasons are enough to avoid this style of hutch entirely.
Ferret cages. There's a reason why these are designed for ferrets, not rabbits! Rabbits are not built to be jumping up and down between levels. They are not climbers by nature - they need a flat, even surface to stay safe. Their spines are super delicate, and they can very easily break their backs or legs given the opportunity. Rabbits love to find creative ways to injure themselves, so their housing has to be as safe as possible. As such, they have to be housed in single level cages.
Litterboxes. It may seem surprising, but you actually don't need a litterbox for your rabbit. If they are housed in a good quality wire floored cage, the poop will drop through the wire into the tray underneath. The purpose of this style of cage is to prevent your rabbit from ever sitting in their own pee and poop. Offering a litterbox defeats the purpose of housing the rabbit on wire by allowing them to sit in their own waste. Instead, it's better to just put litter in the tray underneath the cage and clean it a couple of times per week. That way your rabbit will stay clean and you shouldn't have to worry about any odor.
Rugs, carpets, or beds in their cage. Rabbits just LOVE to chew! As such, anything in their environment has to be completely chew-proof OR safe for them to ingest. Rabbits absolutely love to chew up and eat fabric, a habit which can result in intestinal blockages and often GI stasis. They will also pee on just about anything in their cage, so beds really do not serve any purpose other than a holding ground for pee and poop. Don't worry - your rabbit will be completely fine without a bed! In fact, they wouldn't even use it anyway.
Pet rabbit food. The pellets and hay sold in pet stores or marketed toward pet owners online are very low quality and should be avoided. Pellet brands marketed toward pet owners are super overpriced and very poor in quality compared to show rabbit pellets. I can get a 50 lb bag of high quality show rabbit feed for around $18, but would pay twice that much for a 10 lb bag of poor quality pet rabbit pellets. Also avoid pet store hay, as it is generally the worst pickings and frequently has mold and excessive dust. The bags are also super small, so if your rabbit even eats it, they will go through it very quickly. It's better to get a bale or partial bale from your local feed store. The hay will be better quality and a whole lot cheaper!
Fruits and vegetables. Rabbits have extremely sensitive digestive systems, and cannot tolerate fruits and vegetables in their diet. The high water content and change in their diet disrupts their digestion and causes diarrhea, gas, bloat, and GI stasis. Instead, some healthier treat options would be shredded wheat cereal (the plain, non-frosted kind), rolled oats, or a couple of plain Cheerios.
Plastic or lightweight bowls that do not clip on to the side of the cage. It's best to either get a heavy ceramic style bowl or a bowl that will clip onto the side of the cage. Rabbits see lightweight plastic bowls as toys, and some will choose to throw their bowl around as a game, scattering their food everywhere! While it is super funny to watch, it's best to make sure that they can't throw it around so that they actually manage to eat all of their food.
Willow or plastic balls. While it is totally understandable to want to give your rabbit plenty of toys, it's important to avoid ball shaped ones. Rabbits love to find creative ways to hurt themselves, and have been known to stick a leg or head through ball shaped toys. Any toys you may choose to purchase for your rabbit must be 110% rabbit-proof.