Select: 
Category
All
Graphic ambiguousness
Interpretations within context
Differences between sources
Editorial revisions
Corrections & alterations
Source & stylistic information
Notation
All
Pitch
Rhythm
Slurs
Articulation, Accents, Hairpins
Verbal indications
Pedalling
Fingering
Ornaments
Shorthand & other
Importance
All
Important
Main


b. 20

composition: Op. 27 No 1, Nocturne in C# minor

e2 in GE (→FE) and EE2 (→EE3)

No accidental in EE1

..

In EE1 , the raising e2 to e2 is mistakenly omitted. The error was corrected in EE2 (→EE3).

category imprint: Differences between sources

issues: Errors in EE

b. 21

composition: Op. 27 No 1, Nocturne in C# minor

No sign in GE (→FEEE1EE2)

in EE3

..

Throughout the sources, the sign appears only in EE3.

category imprint: Differences between sources

b. 21

composition: Op. 27 No 1, Nocturne in C# minor

..

We add a cautionary natural before e2 . The natural is also present in EE3.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions

b. 23

composition: Op. 27 No 1, Nocturne in C# minor

GE (→FE)

..

EE is the only source in which the crescendo marking appears. It is certainly an arbitrary addition by analogy with bar 7.

category imprint: Differences between sources

issues: EE revisions

b. 23

composition: Op. 27 No 1, Nocturne in C# minor

FE (→EE)

..

The portato dots are placed below the notes in FE (→EE). Shifting markings to the head side of notes is one of more frequent engravers' mannerisms in Chopin's times.

category imprint: Differences between sources

issues: Inaccuracies in FE , Placement of markings