Issues : Accidental below/above the note

b. 119

composition: Op. 2, Variations, complete

..

There is only one  before the chord at the beginning of the 2nd half of the bar in AsI and A, a  to the bottom note (the bsemiquaver). What is more, in A the accidental was written inaccurately, above the semiquaver, as a result of which GE1 assigned it to d3. Both missing naturals were added in the stage of proofreading of that edition. Chopin's patent oversight was corrected right away in GE1, hence all editions contain the right text (the fact that the  to d3 was printed first is evidenced by the arrangement of the naturals and by the slight difference in size between the  of d3 and the two remaining ones). 

category imprint: Interpretations within context; Differences between sources

issues: Omissions to cancel alteration , GE revisions , Errors of A , Accidental below/above the note , Inaccuracies in A

b. 255

composition: Op. 2, Variations, complete

..

As far as the naturals raising e to e in the 2nd half of bar 255 are concerned, in A Chopin was satisfied with accidentals to the L.H. chord (e1) and the 3rd demisemiquaver (e3). The remaining 3 naturals necessary later in the passage were added by GE (→FE,EE).
In EE the  to the L.H. chord, which was placed slightly too low in GE1, was interpreted as a natural raising d1 to d1.
In A the  to e3 is written too low, at the pitch of c3. Such inaccuracies are often to be found in Chopin's autographs, generally – as is the case here – with no influence on the interpretation of the text.

category imprint: Interpretations within context; Differences between sources; Source & stylistic information

issues: Accidentals in different octaves , Inaccuracies in GE , Errors in EE , GE revisions , Accidental below/above the note , Inaccuracies in A

b. 364

composition: Op. 2, Variations, complete

..

The flat to the 7th semiquaver (d3) is written in A much below the pitch of the note, that is at the pitch of a2. Such inaccuracies, generally without an influence on the text reading, are frequent in Chopin's autographs.

category imprint: Source & stylistic information

issues: Accidental below/above the note