This one is a wild guess

http://www.giantitp.com/comics/oots0707.html
The only prisoner who is not smiling and looks with anger at the goblin who wants to swap side?
A bald guy.

Who maybe has grown back a very few hairs (if it is possible while you are polymorphed, but I guess so)
http://www.giantitp.com/comics/oots0827.html


This one instead seems quite clear to me, now. Compare the position of the hands in the two cases