MK Dons made an instant breaktrhough with a fine effort from Sam Baldock after a minute before Neal Eardley whipped a cross to the far post and Ormerod headed in from six yards bringing the Seasiders level after the break.
MK Dons led once more soon after when Easter reached a through-ball from Balanta and took it around Halstead before shooting into an empty net.
Easter doubled his tally a minute later after playing a one-two with Baldock and slipping the ball past Halstead. But Sylvestre's free-kick to the far post went straight in to get Blackpool back into the tie.
Pool were awarded a penalty following a melee in the box when it seemed that Brett Ormerod was pushed and Adam netted the spot-kick with 10 minutes to go. Substitute Guy, on for Dietmar Hamann, netted with just over 10 minutes of extra-time remaining after Easter was involved in the build-up to end Blackpool's interest in this years Carling Cup.