One thing I’ve noticed over the last few years, after the credits roll, is that there are usually more clips, outtakes and gaffs that the director has decided to mix into the credits.
This film has two such items of interest. One turned out to be a scene which can best be described as a prequel for a possible/probable sequel. The main character was in a new and unrelated story scene talking with a new character.
The next one, much later on in the credits, seems to be what I can only describe, as not a prequel, not a sequel but a “postquel” as in 'post' meaning after movie.
This final scene was an actual continuation of the movie’s storyline, directly related to its content, with an unbelievable twist of the current storyline.

Noun: a friend who is usually only called upon by a friend when a more primary/prominent friend is unavailable.

Taken from the term “second string” in an athletic competition situation. In football, if the star quarterback gets injured during a play, the second string is called off the bench to replace him/her. A “Second String Friend” is essentially benched until needed, if ever.

Synonyms: Plan B, Second Choice, Secondary Friend, Benched Until Needed

opposite of a prequel; the third movie in a series when the series follows the pattern: debut, prequel, postquel