According to Abby's 03 Jul 01 - 06:44 PM posting, "Skin-the-Goat" was the cab driver who refused to testify, and the man who was killed in revenge for turning Queen's Evidence was James Carey. If that is correct, the lines
"Oh .. did ya hear o' Skin-the-Goat?
O'Donnell got him in the boat"
embody a mistake.

Also perhaps just worth a mention: that the Linen Hall is also mentioned in the song Get Me Down Me Petticoat.