I didnt watch, but perhaps their goal, which sounded a bit soft, gave them a shot in the arm? They are a decent team, in form apparently, with 5000 fans getting over excited. Happens year in year out in the 3rd round.
The anomaly in the matches so far was Spurs putting 7 past Tranmere, not Everton having an unexpected, (league position wise), battle against a spirited visitor.
Was another one in which Pickford has saved the first attempt and then an opposition player has slotted the second attempt. Our players rarely seem switched on enough to get to the ball first and clear the danger.