Hmmm, you could always add strips over the seams and sewn them down on both sides. taht would catch the blocks well.
cut strips of fabric maybe 2 inches wide, fold raw edges toward the center and press with iron.
then lay the strip down and pin. sew on each side.
then lay strips across the quilt on all seams and do same.
good luck.
i have one quilt i'm doing with rick rack but it's sewn together already; make the best of your mistake. it's a learning process.