At the start of the "Sono Chi No Sadame" title sequence, the series title appears with a quick montage of all the JoJo heroes (Jolyne, Giorno, Josuke, Jotaro, Joseph, Jonathan) in manga comic pages flipping together, representing the Joestar family and the saga starting with the first JoJo.
The first episode of each JoJo saga does not have an opening title sequence, just a prologue and title.
Some villains/heroes use their Stand power on the title sequences of the episodes where they appear.
The "Sono Chi no Kioku" title sequence references the openings of the previous Jojo saga: at one point the credits read "Sono Chi no Sadame" (the opening for the "Phantom Blood" saga, where Dio had previously appeared) and a lyric states "Stand Proud", the previous "Stardust Crusaders" opening.
A few episodes in the "Diamond is Unbreakable" saga which spotlight minor characters deliberately do not have opening/closing credits.
During the "Bloody Stream" title sequence, when Wamuu performs his Holy Sandstorm (Kamizuna Arashi), the credit for the studio "Kamikaze Douga" briefly changes into "Kamiarashi Douga".
In the "Stand Proud" title sequence, the "series composition" credit changes to "Wryyyyyyy", Dio Brando's Stand cry.