Hi Larry, welcome to the forum.
There are a lot of mold variants, mold errors, mold strike-outs and mold corrections out there. People made mistakes, mold making is a time-consuming process so details were overlooked.
Some mold variants matter a whole lot, but generally I would say collectors go after more significant differences rather than a single letter. A good example would be Drake's Plantation Bitters - collectors pay a lot of attention to the number of logs on the label face, the arabesque decoration, etc.
I am sure the mold error would be of interest to some collectors but in this case my gut reaction is that it does not add anything to the bottle's value.