Nona's Baby Jacket with Hood from Purls Forever
The error is located in Row 3 and should read:

Row 3: K18 (right front), M1, K1 (mark as seam st), M1, K8(sleeve), M1, K1 (mark as 2nd seam st), M1, K21 (back), M1, K1 (mark as 3rd seam st), M1, K8 (sleeve), M1, K1 (mark as 4th seam st), M1, K18 (left front); 85 sts.

Row 4: K7, P71, K7

Row 5: K19, M1, K1, M1, K10, M1, K1, M1, K23, M1, K1, M1, K10, M1, K1, M1, K19; 93 sts.

Row 6: K7, P79, K7