Great suggestions so far.
Cut out prepackaged snacks (e.g. 100 calorie snacks). It's very expensive to have someone divvy up food for you. In fact, get rid of processed foods entirely - lots of empty calories.
Frozen fruits and vegetables are just as nutritious as fresh, sometimes more so (because fresh food transported for 3 weeks across country loses nutrients, whereas foods frozen more or less at the time of picking retain their nutrients). Especially in winter, use frozen foods. I often throw frozen peas into casseroles, and now you can buy frozen green pepper and onions, great for Mexican food and Italian.
Use coupons but only if the brand name is cheaper with coupon than the generic brand. I leave coupons I'm not going to use in the grocery store in the aisles - a lot of people do that and it's great to find a bonus.
We make our own enchiladas with leftover chicken or hamburger or ground turkey, leftover veggies, a little cheese, and some tomato sauce that we season with our own cumin and coriander or cilantro. Leftover refried beans (since it's hard to use the whole can) can be frozen in small containers and defrosted the next time.
Don't use pre-bottled salad dressing - use oil & vinegar. Oil is good for you, vinegar is dirt cheap. Salad dressings have a lot of high fructose corn syrup.
Do the work yourself - don't buy shredded salad mix, buy the whole head and wash/rip it yourself.
Buy what's in season and go without stuff that comes from the other side of the world. You'll appreciate it more when it's in season, just like our grandparents did.
I read the comment about giving chicken bones to your dog - don't do it!! They splinter and are extremely dangerous. Beef bones, yes. Turkey/chicken, no. Sometimes butchers will give you their unused bones, and some say that dogs can eat raw bones but not those from cooked foods.
Don't buy in bulk if it's going to take you a year to use it - that's money sitting in your pantry totally unusable.
Sell stuff at consignment shops, and buy stuff their too.
Most things that say "dry clean only" can be hand washed or freshened in the dryer with dry cleaning kits.
Use white vinegar and water to clean floors, not fancy floor cleaners. Use baking soda to clean porcelain sinks and white casseroles such as Corningware. You can clean shower curtains with a scrub brush and a mild homemade cleanser.
Re-use plastic bags - I rinse them and drape them over a wooden spoon in the drainer, or from a magnetic hook on the side of the fridge. When dry, fold and store in a drawer.
Compost your veggie scraps, stale crackers & bread, fruit cores, coffee grounds, etc. in an outdoor compost bin and use it for gardening and outdoor pots. Add some regular soil (for the worms and other critters that eat the stuff) and grass clippings, shredded leaves, etc. Turn periodically with a shovel or pitchfork. Put it in the sun for faster decomposition.
I think it's great that you have found SO many ways to cut back! Keep it up!!!