A riddle. The use of riddles at feasts is an ancient and favorite amusement. Often large sums were offered for their solution. It always added to the gaiety and interest of the occasion.
Thirty. Obviously, because there were 30 attendants (v. 11).
Sheets. Better, “linen garments.” Believed to be large rectangular pieces of fine linen, which might be worn as an outer garment during the day or as a sleeping wrap for the night. Reference is made to these garments in Prov. 31:24 and Isa. 3:23. Others take them to be undergarments.
Change of garments. These were festal garments, or clothes for dress (see Gen. 45:22).