Spencer Tracy

In the movie,the scene when Henry Drummond(Tracy) calls the opposing attorney Matthew Harrison Brady(Fredic March)to the stand.
Tracy is holding the bible in one hand and the balif holds his bible out to Harrion to swear on it.
Tracy tells him there isn't a need to do that because Harrison speaks the truth.
Anyway, if you watch this movie(scene)DVD or DVR it and pause it at the point when Tracy is holding the bible with his right hand.Tracy, with his left finger very distinctly rubs the side of his nose with his left middle finger. He is flipping off someone, either Harrison or another but following Spencer Tracy's career this doesn't suprise me. Just an observance on my part.

Any comments?