To clarify the slightly vague trope description, let's consider the following examples:
Jabba's appearance in the 1997 remastered edition of Episode IV
: counts (because in the original releases Jabba is mentioned but not seen until later)
Obi Wan Kenobi in Episodes I, II and III
: counts (along with Yoda, the droids, and everything else that counts as a "character" and appears in both the original and prequel trilogies, because )
The [[Manga/Bleach Bleach]] example in which Shinji Hirako appears on a cover art page long before being introduced as a character: doesn't count (because it's just a cover art page and not an "appearance", and anyway it's talking about the original form of the work and not any sort of adaptation)
The Naboo celebration scene added to the 2004 edition of Star Wars Episode VI
: This one is really complicated and hinges on whether or not that the word "chronolically" in the trope description applies solely to the setting's internal chronology. By this interpretation, Naboo and Gungans and such elements were "first introduced" in the prequels, set years earlier, so it doesn't count. But since the Episode VI itself was released before the Gungans' introduction, their appearance in Episode VI is "chronologically earlier" in terms of real-world time.
Furthermore, how does this trope apply to reboots? When the Professor appears in X-Men: First Class
, that seems like it should count as an example, because it's "chronologically earlier" than his "initial" appearance in both the original format and the films' chronology (which is presumably what's being used, to the extent that anything is considered canonical in that mess). But when Bane appears in The Dark Knight Rises
, it probably shouldn't count as an example, because Bane hadn't yet appeared at all in the Dark Knight
chronology, which is presumably more important than the comics' internal chronology, and in any case the two are discontiguous so even if the Dark Knight were explicitly set in a given year and Batman: Vengeance of Bane #1 were set in a later year (somehow) it probably wouldn't count because the two of them "aren't the same Bane" or something. And let's not forget to mention the ultimate extension of this confusion: Old Spock
, whose appearance manages to simultaneously occur several years before his introduction (in the "source" work) and some years after his first scene in this work despite having canonically experienced the events depicted in both some hundred years prior.