Blackpool were denied a third successive league win when they were punished for one defensive error.
Yeovil striker Marcus Stewart lost his markers and glided home a cross from substitute Lee Morris with his head.
Blackpool seemed to have the game wrapped up despite Scott Vernon hitting a penalty wide late in the first half.
Vernon made amends in the second half with his eighth goal of the season, coolly slotting in after Andy Morrell scooped a cross into the box.
Blackpool: Evans, Barker, Jackson, Evatt, Coid (Joseph 34), Gillett (Jorgensen 75), Southern, Fox, Hoolahan, Vernon, Morrell (Parker 79).
Subs Not Used: Jones, Blinkhorn.
Goals: Vernon 56.
Yeovil: Mildenhall, Lynch, Skiverton, Forbes, Jones, Terry (Gray 61), Kalala (Barry 68), Davies, Cohen, Cooper (Morris 79), Stewart.
Subs Not Used: Tonkin, Webb.
Goals: Stewart 86.
Ref: N Miller (Durham).