On Leviticus 14:14, Rashi (or the Rashi found in
Update: The lobe thickens. I followed S.'s advice and just spent way too much time browsing Google Books (thanks for nothing!). Jerold Frakes' Early Yiddish Texts 1100-1750 (see page 1 in Google Books) includes a few pages on the Yiddish and Tsarfatic glosses found in Rashi. Leviticus 14:14, and knarfel, are not among them. I guess then that whatever manuscript my bal-chumesh was working from either (a) had a later addition of this super-gloss, or (b) the publisher just stuck it in. I have yet to look at the printed Rashi manuscripts available through JNUL.