The post-credits is audio only at the end of the credits. (Idea from Star Wars Story)
TPM: Dooku hiring Jango Fett (Audio from Bounty Hunter video game)
AOTC: Maul’s return whispering “Revenge. I must have Revenge.” (audio from TCW)
ROTS: Obi-Wan’s message (Audio from Rebels)
ANH: Vader’s Tie Fighter crash landed
TESB: Vader calling to Luke
ROTJ: Snoke impersonating Palpatine
TLJ: Palaptine’s return.