Clarets youth team coach Terry Pashley again bemoaned defensive errors in the 3-0 defeat to the Seasiders.
After conceding a stunning opening goal, a mistake by U16 goalkeeper Mark Crossley put the game beyond the Clarets.
And a third goal just after half time sealed their fate in their final away game before the Youth Alliance is restructured next month.
Pashley said: "From an attacking point of view, I feel we are doing okay.
"But defensively we have little spells where we do well, then make a glut of mistakes and give ourselves too much to do.
"All season we have failed to get any consistency in the defending and that is perhaps the most frustrating thing.
"We shot ourselves in the foot again at Blackpool with poor defending. We couldn't do much about the first goal, which was a hell of a strike, but the second was a mistake form the keeper on the stroke of half time.
"I told the lads the third goal was the important one because it either put us back in it, or gave us a mountain to climb.
"They got it within ten minutes of the restart and that was that."
Burnley now complete their fixtures with a home game against Preston at Gawthorpe on Saturday morning (11am kick-off).
A new format then kicks in for the remainder of the season.
Burnley: Crossley, Preston, Henry, Avery, Carter, Townsend, Pitham, Booth, Taylor, Carpenter, Pugh.
Subs: Hale, Ince, Hanley, Platt, Heywood.
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