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Verbal indications

b. 81

composition: Op. 21, Concerto in F minor, Mvt III

leggieramente in A & GE2

leggiermente in GE1

leggieremente in FE

leggiero in EE

..

The form of this adverb used by Chopin had already been archaic in his time. Therefore, in the main text we accept the correction introduced in GE1. The form used in FE is erroneous, whereas in EE the adverb was replaced with an adjective. Curiously, GE2 reinstated the incorrect A form.
Similarly in bar 317.
NB. The contemporary Italian orthography approves of leggeroleggeremente only, without 'i'. However, the older orthography is traditionally used in music markings and is not deemed erroneous. 

category imprint: Interpretations within context; Differences between sources

issues: EE revisions , GE revisions , FE revisions

b. 109

composition: Op. 21, Concerto in F minor, Mvt III

 from 2nd beat in A

 from first beat in GE (→FEEE)

..

The placement of the  sign in A is almost certainly an example of the manner of placing indications within and not at the beginning of their scope of validity, sometimes used by Chopin  – cf. e.g. 1st mov., bar 329. This is how it was interpreted already in GE1 (→FEEE, →GE2).

category imprint: Interpretations within context; Differences between sources

issues: GE revisions , Centrally placed marks

b. 131

composition: Op. 21, Concerto in F minor, Mvt III

No indication in sources

[Viol.] suggested by the editors

..

No indication of the change of the leading instrumental group is almost certainly Chopin's oversight, caused by the transition to a new page in A. Four bars further, the composer marked an analogous change.

category imprint: Editorial revisions

b. 137

composition: Op. 21, Concerto in F minor, Mvt III

No indication in A (→GEFE)

Fl. in EE

[Flauto] suggested by the editors

..

In the main text we suggest adding information about the instrument playing the solo melodic figuration. A relevant indication was added already in EE.

category imprint: Differences between sources; Editorial revisions

issues: EE revisions

b. 165-166

composition: Op. 21, Concerto in F minor, Mvt III

..

Chopin erroneously wrote ritenenuto in A. The mistake was not perpetuated in the editions because already GE used the abbreviation riten.

category imprint: Interpretations within context; Differences between sources

issues: GE revisions , Errors of A