When Ned is at the pharmaceutical company talking to the doctor before he sees his father, he breaks a glass and cuts his left hand. The doctor bandages Ned's hand in the restroom. Then as Ned takes Susan's hand prior to walking outside to see his father the bandage is clearly visible on his left hand. However, as they walk side-by-side outside there is no bandage on Ned's hand.
Susan should be at least 39 or 40, according to her past with Henry Fool, but is referred to as being in her early 30 and played by Aubrey Plaza, 29 when she played the role.