While at the Hecks house, Sean Donahue advised that he would give Sue a ride on his way home. The Donahue's live across the street from the Heck's.
In the bathroom when Frankie is admitting to Mike that she hurt her back, Frankie is wrapped in a shower curtain. There was no shower curtain shown when Frankie was in the tub talking to Brick. Also, there's no shower rod. The way the bathtub walls are made, there's no way a shower rod could even be mounted.