“Laurie Partridge...not really playing the keyboards” - The Richmeister (SNL)
I used to get Susan Dey and Peggy Lipton mixed up.
Later on, I could see they are not alike at all if you really look. Susan’s eyes are more distinct, and she tended to smile a lot.
Peggy had smooth, almost a nordic look to her, and kept a more placid expression in public. A young Greta Garbo.