
das Nachspiel
aftermath
The unpleasant or negative consequences that follow an event or action.
Der laute Streit mit den Nachbarn hatte ein gerichtliches Nachspiel.
The loud argument with the neighbors had legal consequences.
aftermath / postlude
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aftermath
The unpleasant or negative consequences that follow an event or action.
Der laute Streit mit den Nachbarn hatte ein gerichtliches Nachspiel.
The loud argument with the neighbors had legal consequences.

postlude
A concluding piece of music played at the end of a concert, church service, or musical work; a postlude.
Zum Abschluss des Gottesdienstes spielte der Organist ein beeindruckendes Nachspiel von Bach.
At the end of the church service, the organist played an impressive postlude by Bach.

afterpiece
A short, often cheerful play that used to be performed after a longer, serious main play.
Nach der langen Tragödie lockerte ein kurzes, komisches Nachspiel die Stimmung im Theater auf.
After the long tragedy, a short comic afterpiece lightened the mood in the theater.
The word is made up of 'Nach-' (afterward) and 'Spiel' (play/game). So it literally describes something that takes place after a main event—the 'Spiel' (play/game). This can be a negative consequence, a piece of music, or a play.
Die Party war toll, aber das Aufräumen am nächsten Tag war ein anstrengendes Nachspiel.
The party was great, but cleaning up the next day was an exhausting aftermath.
In the meaning of 'negative consequence', 'Nachspiel' (aftermath) is often combined with adjectives that evaluate the result. Common phrases are 'ein böses Nachspiel haben' (to have nasty consequences), 'ein gerichtliches Nachspiel' (legal consequences), or 'ein teures Nachspiel' (costly consequences).
Seine unüberlegte Äußerung hatte ein unangenehmes Nachspiel für die ganze Abteilung.
His thoughtless remark had an unpleasant aftermath for the whole department.
The meanings in the fields of music or theater are technical terms. You can recognize them easily from the context: if 'Orgel' (organ), 'Konzert' (concert), or 'Gottesdienst' (church service) is mentioned, a piece of music is meant. In connection with 'Bühne' (stage) or 'Tragödie' (tragedy), a play is meant.
Das Orgel-Nachspiel nach der Trauung war sehr bewegend.
The organ postlude after the wedding ceremony was very moving.
consequence / episode
A Folge can be a positive, negative, or neutral result. Nachspiel, on the other hand, specifically refers to unpleasant consequences that only become apparent afterward. Folge is suitable for a neutral statement; when the later consequences are strongly negative, Nachspiel is more precise.

Der Fehler hatte für die Firma ein unangenehmes Nachspiel.
The mistake had unpleasant consequences for the company.
Die zusätzliche Arbeit war eine Folge des Fehlers.
The extra work was a consequence of the mistake.