There is a good book in this regard called (Al-Nass wal Ijtihad النص والإجتهاد. By Sayyed Sharafuddin.
It is translated into English and available on many sites. https://downloadshiabooks.com/book/al-nass-wal-ijtihad/
'Innovations include :
1. Changing the Athaan and removing Hayya Ala Khairlanji Amal.
2. Changing the Wudhu to washing the feet against the Quranic order to wipe over the feet.
3. Changing the Salah by folding hands which never done by the Prophet.
4. Changing the Khums.
5. Changing the Hajj.
And many other changes which you can find in the above book.
Wassalam.