Leyzer
Not sure everyone knows this but it’s also assur to say Tehillim and let’s say you skipped parts of pesukei dzimra and now want to go back and say them you can’t do so during chazaras hashatz(which you don’t have to halachos ally and according to some seforim is actually quite a bad thing to do al pi kabalah because you are reversing the shefa by going backwards).