I've got about as far as I can with the identifications of the unidentified actors. Of those remaining there are 4 who I have identified, but have not been able to satisfactorily match.
Pablo Álvarez Rubio
My best bet would be the actor in 66/67 (below), but I'm far from certain
José María Labernié
I don't see any obvious matches.
Luis Rivera
We've already been through the identifying process with Rivera in the topic for Fulano y Mengano. Possibly the actor below, but I'm not at all certain.
Luis Torrecilla
The actor below could be a possibility, but again I'm not at all certain, but of the 4 actors here this is the one I think the most likely match