* Online beer sites often indicate that this beer is made with Vitis Labrusca (Fox Grapes). This is an American grape variety and while they do grow in Europe, it's not clear if that is actually the grape that was actually used).
* A second batch of this is apparently in barrels at Cantillon. No details are currently known, including what grape variety was used.
* Table grape Must must, such as this what was used in Don Quijote, is not permitted for use in wine and cannot be exported from Italy. While this story cannot be confirmed, similar stories of issues do exist <ref name=smuggling>Table Grape Must Cargo Seized in Italy, https://www.agra-net.net/agra/foodnews/raw-material/fresh-fruit/grapes/table-grape-must-cargo-seized-in-italy--1.htm</ref>
* There is a photograph of a different, white label Don Quijote bottle that is occasionally posted. All photos of this label appear to come from the same bottle and the legitimacy of this label cannot be confirmed. It is possibly something homemade or produced in small quantities, particularly since Umberto's Don Quijote bottles were apparently never labeled.