General dynamics errors
A part of the piece is played louder or softer than expected: mp instead of mf. Error criterion is note velocity.
Accentuation errors
Same thing as dynamics errors, but mainly for single notes. For example, a "should-be-accentuated note" is played with the same dynamic as the others.
Staccato/legato errors
A staccato (resp. Legato) phrase is played legato (resp. Staccato). Could be classified as duration errors, but have enough musical signification to be one distinct category.