Quark is selling latinum plated renewal scroll pens. It is established later that latinum is liquid, and therefore could not plate anything. Though it could be surmised that this Quark's attempt to sell merchandise to unsuspecting customers with a fancy gimmick.
Lwaxana Troi is able to affect Quark telepathically, but it has been established in Star Trek canon that Betazoids cannot telepathically read or affect Ferengi due to the Ferengi's quad-lobed brain structure.
at 20:00, just as a performer who is juggling 2 gold balls exits the camera's view, the 2 ball collide midair.