This episode was also known as "The Sleight Before Christmas."
Goemon mentions a wine cellar as celebrity Dick Clark's home. This refers to Clark having a youthful appearance even in his senior years; Clark died in 2012 at the age of 82.
Wine is not as flammable as one may think, due to its relatively low alcohol content. Lupin probably knew this and was just scaring Zenigata, but either way he wouldn't have done any real harm.