Except for rest problems, rhythm errors are not directly shown like note errors: Since the score follower is made to follow the performer without caring of rhythm differences between score and performance, the alignment is the same.
Rests are treated like note errors: For a skip rest, the score follower will output a g-rest, and a g-state for an added rest. If we have a g-state with a note-on, error is a note error ; if we have a g-state with a note-off, error is an added rest.
For other rhythm errors, we have to check played time and time of corresponding note in the score, with an updated offset.