From The Catholic World Report:
1) Ordinary prayers and responses in Latin
2) Tabernacle in the sanctuary
3) Altar rails
4) 3 hour Communion fast
5) Communion kneeling
6) Ad orientem
7) No extraordinary ministers
8) Communion on the tongue
9) Singing the proper antiphons with psalms before hymns
10) Chanting the presidential prayers (Collect, Preface, etc.) and the acclamations
11) Using incense, bells, and beautiful vestments
All can be done within the Ordinary Form.
(List by Father Matt Fish @frmattfish)