So for one thing a different Warning to Evelio Javier during his assassination ("Run fast, Evelio!" instead of "Run, Evelio, Run!" So he still gets assassinated, but there would still be butterflies.
So maybe have the Marcos faction be more cautious and send a few paid people to the CBCP to talk with them and encourage the CBCP to become neutral in the matter (basically telling them that the Cory faction is also corrupt based on made-up stories of intimidation, threats, etc.). Cardinal Sin telling the people to go home and not being forced to retract his statement might remove church support for the opposition, or split the church.
The Marcos faction arresting the RAM in the early hours of Feb 22 disguised as defectors.
International: Animpetus for Hu Yaobang being discredited was that the students were emboldened by the OTL recent developments in the Philippines (People Power). Before that, Fang Lizhi vsited Princeton University and therefore became a pro-democracy movement. If this is butteflied away, what would be the effects on China and the world as a whole?
No Chernobyl, and more cautious Gorbachev and co. could lead to the USSR existing today.
Yugoslavia? What are your ideas?
Would you mind giving me free (money) sources about the years 1985-present? Sorry, I'm just a teenager and we don't use credit cards recklessly.
Edit: Fang Lizhi dying in a car crash might be a boon for Hu.