update: When I export a MIDI file, the errant Eb3 is in several tracks(staves). But not all of them.  How do I find them and delete them?  

Here's a pic describing the problem:

And the MIDI Tool view:

It appears to happen when I add a Glissando Smart Shape and copy it to another staff, or transpose the notes.  Removing the Glissando Smart Shape removes the errant note.

Finale 27.2.0.142

This sounds as if you are encountering a keyswitch (a note outside the normal range of the instrument that the VST uses to set a playback quality, like legato, arco or pizz). If so, you need to match the MIDI data with a VST or Human Playback setting that can read the keyswitch and filter its sound from playback.

You need to think where the MIDI file came from and what VST/Instrument combo was used to play it back originally.

Thanks, but the notes sounding are not keyswitch notes.  Eb3 would never be used for a keyswitch(maybe a set of really low basses?) :-).   I'm entering the notes with Speedy Entry and Copy/Paste, I haven't added any keyswitches myself.  The problem seems to be connected to adding a glissando, then copy/pasting notes.  But I haven't been able to identify exactly what's going on.