Sadly you are learning the hard way that rotaries are different. They require more TLC than other cars. Most Mazda dealers have no clue how to work on them either.
Air filter hasn't been replaced. Check you cabin air filter in the glove box and it will look the same.
Easy to do. Open glove box, on the left side is the arm holding it up, press it out of the detent. Then look for the white plastic at the top of the glove box area. Remove, knock out the crud and replace.
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