Jason Cermak is wearing a bad and obvious wig.
Donna Mills is wearing a bad and obvious wig.
When Dawn comes out of gym shower and walks to her locker, she is dressed in a towel and donning a claw hair clip in her pulled back golden locks. It is supposed to be 1973 and claw hair clips were not invented until the 1990's, which were actually a take on the earlier 1980's Banana Clip.
When Dawn/Eugenia is meeting Lillian, Lillian makes a point of telling her, "all the Cutlers work,' but Clara Jean, Philip and Laura Jean are never seen doing any work.